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 Main Menu > GeoGallery > Minerals > Silicates > Topaz with lepidolite 
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Topaz with lepidolite Most topaz come from pegmatites. This large crystal capped with lepidolite is naturally blue. This is rare in nature, however, and most blue topaz is man-made by irradiating and heating colorless or yellow-brown topaz. The chemical composition of topaz is Al2 SiO4(F,OH)2.
Group: Silicates |
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