Réf : BK959
Cavansite on Heulandite - India - 5 cm crystal minerals / 49g / BK959
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Cavansite belongs to the silicate group. It contains calcium, vanadium, silicon, hydrogen, oxygen, and water. Its chemical formula is Ca(VO)Si4O10.4H2O.
The average hardness of Cavansite is 3.5/10 on the Mohs scale (10 for diamond) and its density is greater than or equal to 2.2 (1 for water). The line on the porcelain is white.
CAVANSITE typically occurs in aggregates or rosette-shaped crystals of a beautiful royal blue to dark blue. It is often associated with Heulandite or Stilbite.
Cavansite is a mineral considered quite rare. Its name comes simply from the combination of the three main elements it contains: Calcium, Vanadium, and Silicon.
HEULANDITE belongs to the silicate group. It contains calcium, aluminum, silicon, and water. Its chemical formula is CaAl2Si7O18.6H2O.
The average hardness of Heulandite ranges from 3.5 to 4/10 on the Mohs scale (10 for diamond) and its density is 2.2 (1 for water). The line on porcelain is white or colorless.
Heulandite usually occurs as elongated, flat, tabular crystals with a coffin-like shape. It is often associated with Cavansite or Apophyllite. Like them, Heulandite 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).
Heulandite is usually white but can also be found in green, yellow, red or brown.
The name Heulandite is taken from the name of the English mineralogist JH Heuland.
Unique piece - Contractual photos
Origin: Crystal minerals from India / Poona
Dimensions: 5 x 3.5 x 2.6 cm
Weight: 49 g
