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Rubellite Tourmaline, Quartz, and Lepidolite on Albite

Osmium twinning / Osmium is a hard, brittle, blue-gray or blue-black transition metal in the platinum family and is the densest naturally occurring element, with a density of 22.59 g/cm3 (slightly greater than that of iridium and twice that of lead).

Quartz "Doorway" Specimen |This quartz specimen looks to be a mix of quartz and amethyst. The tall rectangular form of the lighter crystals rise in a form like a doorway to another world. This is a "Mineral Oddity".

Acquamarina (varietà i Berillo) with muscovite Nagar, Hunza Valley, Gilgit District, Northern Pakistan. 320x180 mm

Rhodochrosite / N'Chwanning Mine, Kuruman, South Africa

cavansite with calcite mineralia: Cavansite with Calcite from India by Fabre Minerals