Amethyst
gem · common
Quick facts
- Formula
- SiO2
- Hardness
- 7
- Luster
- Vitreous
- Colors
- Purple to lilac
Purple variety of quartz. Color from iron and irradiation; very common as geodes and points.
Should not be confused with fluorite (hardness 4, octahedral cleavage) or lepidolite (soft mica).
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