mineral
Clear quartz crystal/chunk
Quartz (silicon dioxide, SiO₂)
AI-generated identification · may be incorrectTypically colorless to translucent with a vitreous luster; Mohs hardness 7, no cleavage, conchoidal fracture, and hexagonal crystal structure. The specimen appears irregular and possibly naturally broken or lightly worked, so exact identification from the image is uncertain.
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Physical properties
Typically colorless to translucent with a vitreous luster; Mohs hardness 7, no cleavage, conchoidal fracture, and hexagonal crystal structure. The specimen appears irregular and possibly naturally broken or lightly worked, so exact identification from the image is uncertain.
Formation & geological history
Quartz crystallizes from silica-rich hydrothermal fluids, pegmatites, and igneous rocks, and can also form in sedimentary veins; ages range from recent to billions of years. Common localities include Brazil, Madagascar, Arkansas, and the Alps.
Uses & applications
Used in glass, electronics, abrasives, foundry materials, and countertops; clear crystals are collected and sometimes cut as gemstones. Common rough pieces generally have modest value.
Geological facts
It may be confused with glass or calcite; quartz scratches glass, while calcite does not. Lack of obvious crystal faces prevents confident variety identification.
Field identification & locations
Field tests include hardness, glass-scratching ability, and absence of cleavage; avoid relying on appearance alone. Estimated value: $2–$20 for a common rough chunk, or roughly $20–$100+ if unusually clear, well-formed, or attractive.
