Réf : BE643

Minéral cristallisé de stilibite et apophyllite d'Inde de la famille des zéolites

Stilbite on Apophyllite - India - crystal minerals 7.7 cm / 148g / BE643 - Vignette | 1001 minéraux

Stilbite on Apophyllite - India - crystal minerals 7.7 cm / 148g / BE643

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STILBITE belongs to the silicate group. It contains sodium, calcium, potassium, aluminum, and silicon. The proportion of calcium and sodium varies. Its chemical formula is (Na,Ca0.5,K)9(Al9Si27O72).28H2O.
STILBITE occurs mainly in tabular or coarse crystals, the characteristic of which is the "sheaf of wheat" shape. Stilbite is a zeolite (a group of minerals whose porous structure is essentially composed of aluminosilicate and water molecules. Thus, when a zeolite is heated, the crystals bend as the water evaporates).
Its color is creamy white, pinkish-white, salmon, or translucent. Stilbite's hardness is less than 4/10 on the Mohs scale (10 for diamond) and its density is average, equal to 2.2 (1 for water). The line on porcelain is white. The name Stilbite comes from the Greek word stilbe, which means shine.

APOPHYLLITE belongs to the silicate group. It contains fluorine or hydroxide, potassium, calcium, silicon, and water. Its chemical formula is KCa4Si8O20(F,OH).8H2O.

Apophyllite usually occurs in tabular or prismatic crystals. It is often associated with Stilbite. Like Stilbite, Apophyllite is a member of the zeolites (a group of minerals whose porous structure is essentially composed of aluminosilicate and water molecules. Thus, when a zeolite is heated, the crystals bend as the water evaporates).

The average hardness of Apophyllite ranges from 4.5 to 5/10 on the Mohs scale (10 for diamond) and its density ranges from 2.3 to 2.4 (1 for water). The line on porcelain is white or colorless. Apophyllite is generally white but it also comes in colorless, green, yellow or red.
The name Apophyllite comes from the Greek word apophullisa which means to peel (related to the property of zeolites).

Unique piece - Contractual photos

Origin: Crystal minerals from India

Dimensions: 7.7 x 4.5 x 4.3 cm

Weight: 148 g