trichroic mineral

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Chrysoberyl — General Category Oxide minerals Spinel group Chemical formula Be … Wikipedia
Papagoite — Infobox mineral name = Papagoite category = boxwidth = boxbgcolor = caption = Blue crystalline crust with conichalcite formula = CaCuAlSi2 O6(OH)3 color = Dark blue crystals, light brue when massive habit = Massive; cryptocrystalline, forming… … Wikipedia
Kyanite — General Category Silicate mineral Chemical formula Al2SiO5 … Wikipedia
Sapphirine — Indigo blue sapphirine crystal from Ft. Dauphin, Madagascar (size: 2.1 x 1.9 x 1.4 cm) General Category Silicate mineral … Wikipedia
Pleochroism — is an optical phenomenon in which grains of a rock appear to be different colors when observed at different angles under a petrographic microscope. Pleochroism is caused by the double refraction of light by a colored gem or crystal. Light of… … Wikipedia
tanzanite — noun /ˈtænzəˌnaɪt/ A trichroic violet blue variety of the mineral zoisite mined in Tanzania, used as a gemstone … Wiktionary

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