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Offretite. Mont Semiol, Loire, France. FOV=1.5 mm Photo © Volker Betz

Beautiful Stones Stock Photo - Image: 26734750

Lévyne-Na Ca2.76Na0.96K0.18

Gismondine, CaAl2Si2O8·4(H2O), zeolite group, gismondine family, (Hydrated Barium Calcium Aluminum Silicate) - Morphology: Crystals are bipyramidal, composite to 2 cm. In stellate or radiating aggregates. Ubiquitous twinning on the normal to {100} giving pseudotetragonal individuals.

Fluorite

Aurichalcite Hemimorphite Natural Crystal Specimen - China

Himalayan Pink Crystal Cluster

Fine cluster of Calcite crystals on matrix. From the Stank Mine, Barrow, Cumbria, England.

Crystals

Faujasite Subgroup, Opal Faujasite ( clear Crystals) with Opal (Milkopal)