{"id":3496,"date":"2026-10-30T11:10:19","date_gmt":"2026-10-30T11:10:19","guid":{"rendered":"https:\/\/sagit-global.com\/?p=3496"},"modified":"2026-11-03T14:01:38","modified_gmt":"2026-11-03T13:01:38","slug":"marbre-vert-guatemala-alpes-maurin","status":"publish","type":"post","link":"https:\/\/sagit-global.com\/en\/all-about-marble\/marbre-vert-guatemala-alpes-maurin\/","title":{"rendered":"Green marbles: Guatemala, Alps, Maurin, verde mare"},"content":{"rendered":"

Guatemala green, Alpine green, Maurin green and verde mare are sold as marbles. They are serpentinites and ophicalcites, serpentine rocks that the European terminology standard explicitly distinguishes from marble. The difference is not one of vocabulary: it changes laying, care and possible uses.<\/p>\n\n\n\n

\n

Key points<\/strong><\/p>\n

– None of these stones is a marble in the petrographic sense.<\/strong> La NF EN 12670<\/a> defines serpentinite as a distinct rock, with an explicit cross-reference to the entry \u201cgreen marble\u201d.<\/p>\n

\u2013 The Guatemala green is an Indian serpentinite<\/strong>, quarried mainly in Rajasthan.<\/p>\n

\u2013 The \u201cvert des Alpes\u201d covers two deposits<\/strong> : the French Maurin green, whose quarry is abandoned, and the active Verde Alpi<\/em> from the Aosta Valley. What you buy in France in 2026 is Italian.<\/p>\n

– Maurin green cannot be sourced today.<\/strong> No current production is documented.<\/p>\n

– These stones are laid with two-component epoxy, not cement-based adhesive<\/strong> : the mixing water can warp the slab, which is then lost.<\/p>\n<\/blockquote>\n\n\n\n

Four trade names, two rock families<\/h2>\n\n\n\n

Commercial vocabulary and geological vocabulary do not say the same thing, and that is the source of almost every unpleasant surprise with these stones. A marble, in the petrographic sense, is a metamorphic carbonate rock, composed mainly of calcite or dolomite. A serpentinite<\/strong> is a metamorphic rock composed almost entirely of serpentine, a magnesium silicate whose varieties antigorite and chrysotile are named by NF EN 12670 (2019 edition). An ophicalcite<\/strong> is a serpentinite breccia cut by calcite veins.<\/p>\n\n\n\n

NF EN 12670 goes further than a simple definition: its \u201cserpentinite\u201d entry refers explicitly to the \u201cgreen marble\u201d entry. European standardisation has therefore acknowledged the shift in naming, and corrects it. NF EN 12440 \u201cDenomination criteria\u201d<\/strong>, November 2017 version, requires the trade name to be accompanied by a petrographic name, a colour and a place of origin.<\/p>\n\n\n\n

Trade name in France<\/th>Petrographic nature<\/th>Origin<\/th>Status<\/th><\/tr><\/thead>
Vert de Maurin \/ Vert des Alpes \/ Br\u00e8che de l\u2019Alpet<\/td>ophicalcite<\/strong><\/td>Saint-Paul-sur-Ubaye (04)<\/td>abandoned<\/strong>, \u2248 1945-1950<\/td><\/tr>
Verde Alpi<\/td>metaophicalcite<\/strong><\/td>Aosta Valley, Italy<\/td>active<\/td><\/tr>
Verde Guatemala<\/td>serpentinite<\/strong><\/td>India<\/strong> (Rajasthan)<\/td>active<\/td><\/tr>
Vert de mer \/ Vert de G\u00eanes<\/td>ophicalcite<\/strong><\/td>Genoa region<\/td>historic<\/td><\/tr>
Verde Mare (contemporary)<\/td>serpentinite<\/strong><\/td>Val Malenco, Lombardy<\/td>active<\/td><\/tr>
Verd antique<\/td>serpentinitic breccia<\/strong><\/td>Thessaly, Genoa, Pyrenees, Egypt<\/td>historic<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

This is not an isolated case. Carmignano and Brandao, in the Material Science & Engineering International Journal<\/em> (2023, DOI 10.15406\/mseij.2023.07.00208), list more than 60 trade names<\/strong> of ornamental serpentinites, including Verde Alpi, Verde Antique and Verde Antique Guatemala. The authors note that these names make it difficult to identify the use of serpentinite in some buildings.<\/p>\n\n\n\n

Real origin: India, the Aosta Valley, the Ubaye, Liguria<\/h2>\n\n\n\n

None of the four names refers to where the stone is quarried today. The detail matters, because NF EN 12440 makes the place of origin a naming criterion, and because the availability of a deposit governs the lead time and feasibility of a project.<\/p>\n\n\n\n

Guatemala green comes from India<\/h3>\n\n\n\n

The stone sold under this name is a serpentinite quarried in India, mainly in Rajasthan. It also circulates under the names Verde Guatemala, Forest Green, Verde Guatemala Indiano, Indian Green Marble and \u201cIndian green marble\u201d.<\/p>\n\n\n\n

The trade explanation comes from merchants, not from a scientific source. The original \u201cVerde Guatemala\u201d was indeed a green stone quarried in Guatemala; the civil war cut off supply, and an Indian rock of similar appearance took over the name. The story is consistent and widely repeated, but it does not amount to proof.<\/p>\n\n\n\n

The proof, for its part, lies in the standards. Within European standards, a serpentinite must be designated as a serpentinite: the trade name \u201cGuatemala green marble\u201d does not exempt it from the petrographic name required by NF EN 12440.<\/p>\n\n\n\n

Alpine green: two deposits under one name<\/h3>\n\n\n\n

In older French usage, \u201cvert des Alpes\u201d is a synonym of vert de Maurin<\/strong>, alongside \u201cbr\u00e8che de l\u2019Alpet\u201d. The stone was quarried in the commune of Saint-Paul-sur-Ubaye, in the Alpes-de-Haute-Provence, above the hamlet of Maljasset, near Maurin, at between 2,000 and 2,200 m altitude. The vein measured about 200 m by 50 m. The main operator, Dervill\u00e9 et Cie, employed around a hundred workers there, mostly Italian, from about 1840 to 1960, the last significant work dating from around 1945\u20131950. The quarry is abandoned. Note:<\/strong> all these data rest on a single online synthesis whose bibliography, though serious, could not be consulted.<\/p>\n\n\n\n

On historic uses, caution is needed: the Fondation Napol\u00e9on writes that the base of Napoleon\u2019s tomb at Les Invalides is made of green Vosges granite, not Maurin green, an attribution that is nevertheless widely repeated. The other prestigious uses attributed to it remain to be verified.<\/p>\n\n\n\n

The \u201cvert des Alpes\u201d sold in France in 2026 is something else: it is Verde Alpi<\/strong><\/em> from the Aosta Valley. Petrographically, it is a metaophicalcite<\/strong> belonging to the upper Penninic Tsat\u00e9 nappe, Combin zone: tectonic breccias of angular serpentinite fragments in a light to greenish matrix of carbonates and silicates. The Aosta Valley family includes Verde Aver, Verde Issorie, Verde Saint-Denis and Verde Issogne, and ophicalcite quarries are documented at Verrayes.<\/p>\n\n\n\n

The same rock family, then, but two deposits: one French and closed since about 1950, the other Italian and active. The practical consequence, and it is a service to the buyer: Maurin green cannot be sourced today.<\/strong> A quote promising \u201cvert des Alpes\u201d will deliver Italian stone unless proven otherwise.<\/p>\n\n\n\n

Verde mare: Genoa yesterday, Val Malenco today<\/h3>\n\n\n\n

\u201cVert de mer\u201d is a trade name, and it too covers two realities. The historic French meaning is Genoa green<\/strong>, an ophicalcite whose serpentine gives the green and talc the white veins. It was quarried around Genoa from the 16th century, at Passo della Bocchetta, Voltaggio and Pietra Lavezzara, some twenty kilometres north of the city. Four abandoned quarries are recorded in the Monte Figogna tectonic unit. The uses cited are the windows of Versailles, panels of the Pont de la Concorde and pillars of Saint-Sulpice. Note:<\/strong> these attributions come from an online encyclopaedic source, without institutional confirmation.<\/p>\n\n\n\n

The contemporary meaning is Verde Mare<\/strong><\/em>, a serpentinite from Val Malenco, in Lombardy, province of Sondrio, also sold as Verde Malenco and Malenco Serpentinite.<\/p>\n\n\n\n

The parent term for this whole family is the verd antique<\/strong>, theatracius lapis<\/em> of the Romans: a serpentinitic breccia with dark green serpentine flecked with white in a matrix of calcite, dolomite or magnesite. It was worked in Thessaly near Larissa, on the Genoa coast, in the Pyrenees and in Egypt.<\/p>\n\n\n\n

Data sheet: what is measured, and what is not<\/h2>\n\n\n\n

For this query, no French page publishes a single technical value. Here is the real situation, with the corresponding test standards and the gaps acknowledged. A test value applies to a batch, not to a variety: the supplier\u2019s data sheet is what counts.<\/p>\n\n\n\n

Features<\/th>Test standard<\/th>Status of the data<\/th><\/tr><\/thead>
Petrographic name<\/td>NF EN 12407<\/td>serpentinite or ophicalcite depending on the stone<\/td><\/tr>
Water absorption at atmospheric pressure<\/td>NF EN 13755<\/td>Verde Guatemala: 0,30 %<\/strong> declared by Tino Natural Stone (not re-checked)<\/td><\/tr>
Density<\/td>NF EN 1936<\/td>Verde Guatemala: 2.72 g\/cm\u00b3<\/strong>, same data sheet (not re-checked)<\/td><\/tr>
Impact resistance<\/td>standard not specified on the data sheet<\/td>Verde Guatemala: 1,250 N<\/strong>, same data sheet (not re-checked)<\/td><\/tr>
Open porosity<\/td>NF EN 1936<\/td>not available for these stones<\/td><\/tr>
Frost resistance<\/td>NF EN 12371<\/td>not sourceable<\/strong> : to be declared by the supplier<\/td><\/tr>
Flexural strength under centre-point load<\/td>NF EN 12372<\/td>not available<\/td><\/tr>
Hardness<\/td>no EN standard in force for the rock<\/td>mineralogy alone: antigorite 2.5 to 3.5<\/strong> Mohs, calcite 3<\/strong><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

The three figures above come froma single producer data sheet<\/strong>, for a single stone<\/strong>, and they could not be re-checked against the source PDF. They do not describe \u201cgreen marble\u201d: they describe the batch that data sheet documents.<\/p>\n\n\n\n

On hardness, two sources contradict each other. The Natural Stone Institute gives serpentine between 3 and 6 Mohs; the reference mineralogical data sheets give antigorite between 2.5 and 3.5, with a measured density of 2.65 g\/cm\u00b3. The difference can be explained, and the explanation is more useful than the comparison: a serpentinite is not monomineralic<\/strong>. Magnetite, chromite and olivine raise the hardness; talc and chrysotile lower it. A serpentinite is therefore heterogeneous in hardness<\/strong>, from one point to another on the same slab. Scratch resistance cannot be deduced from a single figure. So we should stop repeating that \u201cgreen marble is harder than white marble\u201d: it is not established.<\/p>\n\n\n\n

Frost resistance, for its part, is documented nowhere for these stones. Before any exterior use in a frost zone, require the declaration of performance for the batch under NF EN 12<\/a>371, which provides for two types of test: technological, over a set number of freeze-thaw cycles, and identification, until failure.<\/p>\n\n\n\n

On thicknesses, the data sheets consulted give nothing. Commonly cut slab thicknesses are 20 and 30 mm, to be confirmed stone by stone: this point is not neutral, for a reason explained in the next section.<\/p>\n\n\n\n

Asbestos: a quarrying and works issue, not a finished-product issue<\/h3>\n\n\n\n

The BRGM maps the environmental asbestos<\/strong> hazard at the request of the Direction g\u00e9n\u00e9rale de la pr\u00e9vention des risques, at scales from 1:1,000,000 to 1:5,000. It notably identifies tremolite asbestos in mylonitic serpentinites and actinolite asbestos in ophiolitic metabasalts. Serpentinites therefore belong to formations mapped under this hazard.<\/p>\n\n\n\n

The framing must be precise: the hazard concerns outcrops and works on natural ground, not a laid polished slab.<\/strong> It is a quarrying and works issue, regulated as such, not a finished-product issue. The mapped areas cover the Alps, Corsica, the Pyrenees, the Massif Central, the Armorican Massif, the Vosges and the Maures-Tanneron massif. Note:<\/strong> the Alpes-de-Haute-Provence do not appear by name in the 1:50,000 list consulted, unlike the Hautes-Alpes.<\/p>\n\n\n\n

Laying: two-component epoxy, not cement-based adhesive<\/h2>\n\n\n\n

This is the most useful information in this article, and it is missing from every French page selling these stones. Laid with cement-based adhesive, a green marble slab can warp and debond, and is then lost.<\/p>\n\n\n\n

The mechanism is described by Mapei in its technical bulletin 010403-TB, \u201cInstalling moisture-sensitive stone\u201d<\/a>, edition of 22 June 2015. Water reacts chemically with the minerals in the stone, and the slab changes shape, which the bulletin calls cupping<\/em>, curling<\/em>, doming<\/em> or warping<\/em>. It gradually comes away from its bed and ends up breaking the bond. Mapei writes that a slab that has changed shape generally can be neither repaired nor relaid. The aggravating factor is explicit: the thinner and larger the slab, the greater the risk.<\/strong> That is why thickness is not an aesthetic detail with these stones.<\/p>\n\n\n\n

The same bulletin lists by name, among moisture-sensitive stones, Verde Alpi<\/strong>, the Verde Guatemala<\/strong>, the Verde Mare<\/strong> and theIssoire Green Marble<\/em>, which the bulletin also gives under the names Verde Issori<\/strong> and Verde Aver<\/strong>. It adds non-green stones such as Nero Marquina, Portoro and Rosso Levanto. Also covered are cement- or resin-based agglomerates made with chips of these stones.<\/p>\n\n\n\n

The prescription comes from the sector\u2019s reference manual. The Natural Stone Institute<\/strong>, in the Dimension Stone Design Manual<\/em> version VIII, \u00a7 3.1.4.1, calls for a 100% solids two-part epoxy<\/strong> as a laying bed for green marbles and serpentines prone to warping. Custom Building Products writes, in its bulletin TB19, that all other adhesive mortars, epoxy emulsions and mastics contain water and must not be used. Laticrete intends its LATAPOXY 300, compliant with ANSI A118.3<\/strong>, for marbles that tend to stain, darken or warp when laid with water-based products.<\/p>\n\n\n\n

Mapei adds two limitations that are often forgotten. Even with water-free laying products, use remains limited to dry rooms or rooms with limited water exposure<\/strong>. And a waterproofing or uncoupling membrane lengthens the drying of the mortar, which can make a normally non-sensitive stone move: in that case, a rapid-setting mortar is required.<\/p>\n\n\n\n

Take care not to confuse this phenomenon with the bowing<\/em> of white marble fa\u00e7ade panels, which stems from the anisotropic thermal expansion of calcite and from Siegesmund\u2019s work. Different mechanism, different stone, different context.<\/p>\n\n\n\n

No French standard names these stones<\/h3>\n\n\n\n

It is better to say so frankly than to invent a reassuring French reference. Having checked, no French standard names green marbles or serpentinites as water-sensitive stones.<\/strong> Neither NF DTU 52.2, published on 25 June 2022, nor NF B10-601, nor the CTMNC documents consulted mention them. The August 2015 note on the changes to the amended NF DTU 52.2 deals with bonding surfaces, flatness, classes C1, C2 and C2S and cleavable materials, without a word about water sensitivity.<\/p>\n\n\n\n

What NF DTU 52.2 does govern, and can be cited, is something else. The choice of adhesive mortar depends on the open porosity<\/strong> measured to NF EN 1936, with a threshold of 2%, and on the surface area of the element. The rule on greens comes from the Natural Stone Institute manual and from adhesive manufacturers. Hence the only robust instruction: ask the supplier whether the stone is water-sensitive before laying it<\/strong>, and get the answer in writing.<\/p>\n\n\n\n

Care: these stones do not react like marble<\/h2>\n\n\n\n

The simplest test is also the most telling. The Natural Stone Institute, through an article by the geologist Karin Kirk<\/a> published on 13 March 2018, points out that marble is<\/a> attacked by vinegar, serpentine is not<\/strong>. A serpentinite therefore does not behave like a calcitic marble when faced with a descaler or lemon juice. A necessary caveat: this test is destructive; it must not be done on a laid slab or on a sample intended for a client.<\/p>\n\n\n\n

An ophicalcite is a mixed case, and this is mineralogical reasoning, not a measured value: its veins are calcite, so they can be attacked by an acid, while the serpentine background cannot. An Alpine green or a verde mare therefore does not behave uniformly under acid attack. Note:<\/strong> no source consulted quantifies the acid resistance of an ophicalcite, the only sourceable statement being qualitative.<\/p>\n\n\n\n

The same heterogeneity applies to abrasion, since hardness varies from one mineral to another within the rock. For a worktop or a busy floor, this matters more than an average hardness figure. A water-repellent or impregnating sealer reduces absorption without making the stone waterproof, and is renewed according to exposure. It does nothing, however, about the risk of warping, which is a laying-bed problem, not a surface one.<\/p>\n\n\n\n

Greens compared: which exist, and for which use<\/h2>\n\n\n\n

Three greens can actually be sourced in 2026: Verde Guatemala<\/strong> (Indian serpentinite), the Verde Alpi<\/strong> (Aosta Valley meta-ophicalcite) and Verde Mare<\/strong> (serpentinite from Val Malenco). vert de Maurin<\/strong>, the Genoa green<\/strong> and verd antique<\/strong> are historic stones: you come across them in restoration and reuse, not in a catalogue. Any promise to deliver Maurin green deserves to be checked at source.<\/p>\n\n\n\n

Names that describe appearance do not describe the rock. \u201cLight green marble\u201d, \u201cemerald green\u201d, \u201cgreen and white\u201d are visual descriptions: they say nothing about the petrographic nature, the origin or the water sensitivity. Two stones of identical appearance can belong to two different families and be laid differently. That is exactly what NF EN 12440 targets by requiring, alongside the trade name, a petrographic name, a colour and a place of origin: ask for all three, and you have your answer.<\/p>\n\n\n\n

For use, three criteria come before aesthetics. Thickness and format first, because the risk of warping increases with thinness and large size. Then the laying method, which must be decided before ordering, not on site, particularly for a marble slab<\/a> over a large area. Finally, exposure to water, which remains the main contraindication: these stones should be kept for dry rooms or rooms with limited water exposure. That steers them towards walls, splashbacks, table tops and made-to-measure interior floors<\/a> outside wet rooms, rather than a shower floor.<\/p>\n\n\n\n

One last distinction concerns the material: for this query, polished porcelain stoneware tiles are sold under the name \u201cGuatemala green marble\u201d. These are ceramic products, with neither the same product standard, nor the same behaviour, nor the same laying constraints as the stone described here.<\/p>\n\n\n\n

Frequently asked questions<\/h2>\n\n\n\n

What is green marble called?<\/h3>\n\n\n\n

There is no single name, and none is a rock name. The most common names in France are vert du Guatemala (an Indian serpentinite), vert des Alpes or Verde Alpi<\/em> (Aosta Valley meta-ophicalcite), vert de mer or vert de G\u00eanes (a Ligurian ophicalcite). To these can be added Verde Mare<\/em> (serpentinite from Val Malenco), vert de Maurin (an ophicalcite from the Ubaye) and verde antico. The scientific literature lists more than 60 trade names for ornamental serpentinites. The only name that commits a supplier on a quote is the petrographic name required by NF EN 12440.<\/p>\n\n\n\n

What is the rarest marble colour?<\/h3>\n\n\n\n

No standard and no public inventory ranks stones by rarity of colour: a quantified answer would be invented. The question of availability<\/strong> can be checked, and is more useful. Among the greens, Maurin green, Genoa green and verde antico are no longer quarried; only Verde Guatemala, Verde Alpi and Verde Mare can be sourced today. A historic name still found in catalogues therefore does not guarantee that a stone still exists.<\/p>\n\n\n\n

What is the most expensive marble in the world?<\/h3>\n\n\n\n

There is no public, verifiable ranking of natural stone prices, and this article publishes no prices. What determines the cost of a green can be identified: the real nature of the rock, the state of the deposit and its availability, the thickness and format required, the finish, and the laying method. That last point is often underestimated: laying with two-component epoxy has neither the same cost nor the same constraints as laying with cement-based adhesive. For an estimate on your project, contact us<\/a>.<\/p>\n\n\n\n

In summary<\/h2>\n\n\n\n

These four green stones all bear a name that describes neither their rock nor their origin. They are serpentinites and ophicalcites: NF EN 12670 says so and NF EN 12440 requires it to be written. Two consequences govern everything else: Maurin green is no longer available, and these stones are laid with two-component epoxy, on pain of losing the slab. Before ordering, have three things written on the quote: the petrographic name, the place of origin, and the answer to the question \u201cis this stone water-sensitive?\u201d. To look at the greens available and decide on thickness, format and laying method, contact us<\/a>.<\/p>\n\n\n\n

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Green marbles from Guatemala, the Alps, Maurin or verde mare: serpentinites and ophicalcites. 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