mineral
Amethyst in quartz matrix
Quartz, SiO₂; purple coloration from trace iron and irradiation
AI-generated identification · may be incorrectAmethyst has Mohs hardness 7, a vitreous luster, and hexagonal crystal structure; quartz lacks cleavage and breaks with conchoidal fracture. The specimen shows purple amethyst with white to translucent quartz.
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Physical properties
Amethyst has Mohs hardness 7, a vitreous luster, and hexagonal crystal structure; quartz lacks cleavage and breaks with conchoidal fracture. The specimen shows purple amethyst with white to translucent quartz.
Formation & geological history
Crystallized from silica-rich fluids in cavities, commonly within volcanic rocks; its age depends on the host formation and cannot be determined from the photo.
Uses & applications
Amethyst is used in jewelry, ornaments, and mineral collections; quartz also has major industrial uses.
Geological facts
Amethyst is the purple variety of quartz, with color related to iron impurities and natural radiation.
Field identification & locations
Look for purple quartz crystals, often with white quartz or agate, and test hardness only on an inconspicuous spot. Common sources include Brazil, Uruguay, and Zambia.
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