mineral
Amethyst cluster
Quartz (SiO₂), purple variety; crystalline quartz cluster
AI-generated identification · may be incorrectMohs hardness 7; translucent purple to gray-violet, vitreous luster, trigonal crystal system, and no cleavage (conchoidal fracture). The photo shows a small cluster of intergrown crystals.
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Physical properties
Mohs hardness 7; translucent purple to gray-violet, vitreous luster, trigonal crystal system, and no cleavage (conchoidal fracture). The photo shows a small cluster of intergrown crystals.
Formation & geological history
Forms as quartz crystals in cavities and veins, commonly in volcanic rocks as silica-rich fluids cool; deposits range from ancient to geologically recent.
Uses & applications
Used for jewelry, ornamental objects, and mineral collecting; this modest specimen is primarily decorative.
Geological facts
Amethyst’s purple color is associated with iron impurities and natural irradiation; heating can change it toward yellow or orange citrine tones.
Field identification & locations
Look for glassy, pointed quartz crystals with purple coloration and hardness sufficient to scratch glass. Common sources include Brazil, Uruguay, Zambia, and other quartz-bearing regions.
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