mineral
Polished quartz crystal point
Quartz (silicon dioxide, SiO₂)
AI-generated identification · may be incorrectMohs hardness 7; colorless to milky white with vitreous luster and internal veils/fractures. Trigonal crystal structure, typically lacking cleavage and showing conchoidal fracture; specific gravity about 2.65.
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Physical properties
Mohs hardness 7; colorless to milky white with vitreous luster and internal veils/fractures. Trigonal crystal structure, typically lacking cleavage and showing conchoidal fracture; specific gravity about 2.65.
Formation & geological history
Formed when silica-rich fluids crystallize in cavities, veins, or pegmatites, commonly during hydrothermal activity. The exact geological age and locality cannot be determined from the image; polishing and shaping are human processing.
Uses & applications
Used as a decorative specimen, in crystal collecting, and occasionally for metaphysical practices; quartz is also important in glass, ceramics, electronics, abrasives, and optical instruments.
Geological facts
The pointed form is likely cut and polished rather than a naturally terminated crystal. Cloudiness commonly results from microscopic fluid inclusions, fractures, or dispersed mineral impurities.
Field identification & locations
Identify quartz by its glassy luster, hardness sufficient to scratch ordinary glass, lack of cleavage, and six-sided crystal geometry; quartz points commonly come from Brazil, Madagascar, China, and Arkansas, USA.
