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Polished Barite with Marcasite - Lubin, Poland

Hübnerite and Quartz minor dusting of Pyrite! Specimen shows deep red internal reflections when backlit. Huayllapon Mine, Peru

Agate (chalcedony) makroglobulyarnogo buildings - one more reason to think about the specific role of silica gel in the crystallization of agates. Sample 14 × 9cm., China.

Green Amber (fossilized tree resin from an ancient relative of a tropical species called “algarroba”) from Dominican Republic

Lake Superior Agate influenced by hydrothermal fluids

Spinel displaying “Star of David” twinning

Scheelite Fluorescence in Shortwave UV

Moonstone - Sri Lanka / moonstone consists of albite, alternating with layers of either Orthoclase or Sanidine. The layering interferes with the light entering the stone, resulting in a shifting blue glow known as adularescence (after the gem's original name: "adularia").

Kyanite :: From Merelani Hills . Lelatema Mountains . Arusha Region . Tanzania