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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).

Calcite included by Aurichalcite from Mexico

Corundum var. Ruby - Jagdalak Ruby Mine, Sorobi District, Konar Province, Afghanistan

Tourmaline var. Elbaite | Pakistan

Crater and Basaltic Rock on Mars

Vintage Print Rocks and Minerals Tourmaline and by PineandMain. $6.00, via Etsy.