Description
This Prehnite crystal C is a mostly dark green and about 2 by 1.50 inches. It is botryoidal and come from the Atlas Mountains of Morocco. Prehnite is a calcium aluminum silicate mineral with the formula Ca2Al(AlSi3O10)(OH)2. It usually forms in stalgtitic or botryoidal crystals within volcanic cavities and hydrothermal veins..
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