mineral
Likely amethyst crystal fragment
Quartz, SiO₂; purple coloration from iron-related defects and irradiation
AI-generated identification · may be incorrectSmall translucent crystal with pale purple zoning and vitreous luster; quartz hardness is Mohs 7, with no true cleavage and conchoidal fracture. The visible form appears broken or partially worn, so crystal habit is uncertain.
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Physical properties
Small translucent crystal with pale purple zoning and vitreous luster; quartz hardness is Mohs 7, with no true cleavage and conchoidal fracture. The visible form appears broken or partially worn, so crystal habit is uncertain.
Formation & geological history
Amethyst forms when silica-rich hydrothermal fluids fill cavities in volcanic rocks, especially basaltic lava, and trace iron is later irradiated. Specimen age depends on its host deposit, commonly ranging from tens to hundreds of millions of years.
Uses & applications
Used for inexpensive jewelry, ornamental objects, healing-culture displays, and mineral collections; this small fragment has minimal commercial value.
Geological facts
Amethyst is the purple variety of quartz; uneven color zoning and translucency are typical. Strong heating can turn some amethyst yellow-orange, producing citrine-like material.
Field identification & locations
Look for purple zoning, glassy luster, hardness sufficient to scratch ordinary glass, and quartz-like conchoidal fracture; confirm with magnification because dyed glass or ceramic can resemble it. Common sources include Brazil, Uruguay, Zambia, and Mexico.
