gemstone
Star Amethyst
Quartz (Silicon Dioxide, SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, purple color, vitreous luster, hexagonal crystal system, exhibits asterism (six-rayed star effect due to microscopic inclusions).
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Physical properties
Hardness of 7 on the Mohs scale, purple color, vitreous luster, hexagonal crystal system, exhibits asterism (six-rayed star effect due to microscopic inclusions).
Formation & geological history
Forms in hydrothermal veins or cavities of volcanic rocks when iron impurities and microscopic inclusions align to create chatoyancy.
Uses & applications
Used primarily in fine jewelry, pendants, and as a collectible gemstone.
Geological facts
The star effect, known as asterism, is caused by light reflecting off oriented needle-like inclusions within the quartz matrix.
Field identification & locations
Identified by its distinct purple hue and floating six-rayed star when rotated under a direct light source; commonly found in Brazil and Madagascar.
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