mineral
Quartz geode half
Quartz (SiO₂), likely a druzy quartz-lined geode
AI-generated identification · may be incorrectWhite to pale-gray crystals with a vitreous luster and uneven crystalline surface; quartz has Mohs hardness 7, a trigonal crystal structure, and no cleavage. The dark outer rind appears to be host rock, but the image does not show enough detail to identify it.
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Physical properties
White to pale-gray crystals with a vitreous luster and uneven crystalline surface; quartz has Mohs hardness 7, a trigonal crystal structure, and no cleavage. The dark outer rind appears to be host rock, but the image does not show enough detail to identify it.
Formation & geological history
Quartz crystals grew from mineral-rich fluids in a cavity within host rock; the specimen’s specific age and geological setting cannot be determined from the image.
Uses & applications
Small geode halves are used for display and collecting; quartz is also used in glass, electronics, and abrasives.
Geological facts
A geode forms when crystals line a cavity, often leaving a hollow center; this example appears partly filled or cut through the crystal lining.
Field identification & locations
Look for a distinct outer rind surrounding an interior of inward-growing crystals; confirm quartz by its hardness and lack of cleavage. Similar specimens occur worldwide in volcanic and sedimentary rocks.
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Epidote
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