|Mineral||mineral species Prehnite|
|Category||Rocks and minerals|
|Formula Ca2Al(Si3Al)O10(OH)2] PREHNITE|
|O||Oxygen||Other no metal||44.5%|
|Ca||Calcium||Alkaline earth metal||20.27%|
|H||Hydrogen||Other no metal||0.25%|
Prehnite is a mineral composed of hydrated silicic acid and aluminum. It is colorless to greenish yellow, light green or white and has a glassy, silky texture. Its luster is vitreous to faintly adamantine. Prehnite is usually found in hydrothermal formations and is commonly associated with grossular, phenakite, chlorite, and chalcedony. Optically, it lies at the intersection between anorthite and hydrated silicic acid and belongs to the optical class of clear minerals. Its hardness is between 5 and 6 on the Mohs scale and its density is 2.7 to 3.2 g/cm3. Prehnite is primarily used as a semi-precious stone for making jewelry and carvings, but it is also used in industrial applications such as flooring for high traffic environments and use as a putty, cement and glass of construction.
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