Gem crystals
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Ruby, spinel, topaz, tourmaline and many other precious sounding gems are not just available as cut gems but also as natural crystals.
Emerald crystal on calcite matrix
Multicolored tourmaline from Afghanistan
Aquamarine with feldspar from Pakistan
Orange spessartite garnet in schist from Tanzania
Not a gem crystal in a strict sense but gem material nevertheless: rough opal
Ruby crystal from Kenya
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