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Topaz is a neosilicate mineral. It has a hardness of 8 (Mohs), forms crystals in a wide range of possible colors, and these are prized as gemstones.

Realgar (an arsenic sulfide mineral, also known as "ruby sulphur" or "ruby of arsenic"): ruby-red crystals in translucent Calcite scalenohedrons

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Morganite Gemstone

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Designer Druzy Stone Cabochon Stunning Crystals AAA Gemstone 38mm (1849)

Druzy Quartz

Pyrite inclusions in Quartz - wow - such a great piece of quartz...and the way that pyrite's floating in it...magic!