Prehnite (mineral)

Prehnite crystals, a selection of specimens of this crystallized mineral species. The prehnite is a mineral, here many pieces of collection presented with a description, one or more photos and sometimes a video. These prehnites are for sale. It is a silicate, subgroup of phyllosilicates, with chemical formula Ca2Al(Si, Al)4O10(OH)2 and orthorhombic crystal system.