Meerschaum is a mineral with a hardness of 3 out of 10 on the Mohs scale of mineral hardness [?]. These Monoclinicly structured gems are made of hydrated magnesium silicate, their full chemical compound being Mg4Si6O15(OH)2.6H2O.

Meerschaum is a clay-like hydrous magnesium silicate. It has no crystals, and occurs as earthy aggregates, porcellanous masses, nodular, and porous. In the fresh state it is soapy and soft, but hard when dried. It sticks to the tongue and its taste sets the teeth on edge.

It is opaque, has flat conchoidal, earthy fracture, and an orthorhombic microcrystalline system.

Because of its high porosity, meerschaum can float on water. It is very porous and has a dull, greasy luster. The color may be white, reddish, yellowish, greyish or bluish green.

It is soft, light, and can easily be cut with a blade. It is so fine-grained that even very thin fragments are opaque. It becomes plastic when mixed with water. It is almost infusible and insoluble in acids.

It is formed as the decomposition product of serpentine, and occurs as concretions within that rock.

The only imporant occurrence is in Eskischehir, Anatolia (Turkey). Nodular masses also occur in Spain, Greece, Czechoslovakia, Morocco, and the USA (Utah, California, Pennsylvania, and New Mexico).

Meerschaum is also called Sepiolite.

Other names include agaric chalk, keffekilite, Bosnian sepiolite, falcondoite (when it contains nickel), loughlinite (when sodium is present), and piedra de savon Maroc (from Morocco, used as soapdish).

The specific gravity [?] for Meerschaum is 1.5, it's refractive index [?] is 1.51-1.53, and it's double refraction [?] is None.

History

Meerschaum takes its name from the German, meaning "sea foam."

Industrial Usages

Meerschaum is used for heat and sound insulation, and is worked into bowls for tobacco pipes and cigarette holders, which, because of the smoke, gradually becomes yellowish. It is also made into costume jewelry. It becomes lustrous when impregnated with grease.

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Terms

Double Refraction or dr is the ability of a mineral to separate a refracted ray of light into 2 rays. If held over an image or text it will display the object 2x its original size.

Mohs Scale of Mineral Hardness is the standard used to categorize a mineral's ability to resist scratching. It gets its name from Friedrich Mohs, the German geologist who first created the scale.

RI or Refractive Index defines light's ability to move through the mineral or in a general sense, any material.

SG or Specific Gravity is the ratio of the weight of any substance to that of pure water at temperature of 3.98°C(39.2°F) and standard atmospheric pressure. This is important to note when actively seeking these minerals in the wild. Minerals with a higher SG will settle below material with a lower sg over time.