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This is a list of gemstones, ... Rock crystal (var.) Shocked quartz (var.) Smoky quartz (var.) ... Printable version; In other projects
Amethyst crystals – a purple quartz Apophyllite crystals sitting right beside a cluster of peachy bowtie stilbite Aquamarine variety of beryl with tourmaline on orthoclase Arsenopyrite from Hidalgo del Parral, Chihuahua, Mexico Aurichalcite needles spraying out within a protected pocket lined by bladed calcite crystals Austinite from the Ojuela Mine, Mapimí, Durango, Mexico Ametrine ...
Bahia Emerald [2]; Carolina Emperor, [3] [4] 310 carats uncut, 64.8 carats cut; discovered in the United States in 2009, resides in the North Carolina Museum of Natural Sciences, Raleigh, NC, US
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Optical properties of common minerals Name Crystal system Indicatrix Optical sign Birefringence Color in plain polars Anorthite: Triclinic: Biaxial (-) 0.013
Crystal is a transparent mineral resembling glass, most probably a variety of quartz. Job places it in the same category with gold, onyx, sapphire, glass, coral, topaz, etc. The Targum renders the qrt of Ezech. as "ice"; the other versions translate it as "crystal". Crystal is again mentioned in Apoc., iv, 6; xxi, 11; xxii, 1.
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Taaffeite (/ ˈ t ɑː f aɪ t /; BeMgAl 4 O 8) is a mineral, named after its discoverer Richard Taaffe (1898–1967) who found the first sample, a cut and polished gem, in October 1945 in a jeweler's shop in Dublin, Ireland.