Bertrandite (mineral)

Bertrandite crystals, a selection of specimens of this crystallized mineral species. Bertrandite is a mineral, here many collectibles presented with a description, one or more photos and sometimes a video. These bertrandites are for sale.
It is a beryllium sorosilicate with the chemical composition Be₄Si₂O₇(OH)₂ and the orthorhombic crystal system.