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Amethyst [G8143]
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GeoFacts
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Photograph of a rectangular banded amethyst/clear quartz (G8143) from the National Gem Collection Photo by Chip Clark |
Quartz
All quartz have the same arrangement of silicon and oxygen atoms. Because they grew under different conditions, they exhibit an incredible variety of shapes and colors. Impurities cause the distinctively colored gem varieties: rose quartz (pink); citrine (yellow or gold); amethyst (purple); and smoky quartz (black or brown).
Hover over color tiles above to learn what this object tells us about the history of the Earth
| Catalog # | Mineral | Country | Weight | |
|---|---|---|---|---|
| G8143 | Quartz (var. Amethyst) | Unknown Locality | 15.87 ct | More info » |
Images of this specimen
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