mineral
Quartz crystal on granite
Quartz, SiO₂; host rock is likely coarse-grained granite
AI-generated identification · may be incorrectThe clear-to-cloudy, glassy crystal appears to be quartz, Mohs hardness 7, with no cleavage and irregular fracture. The tan, speckled host has visible interlocking mineral grains typical of granite, commonly quartz, feldspar, and mica.
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Physical properties
The clear-to-cloudy, glassy crystal appears to be quartz, Mohs hardness 7, with no cleavage and irregular fracture. The tan, speckled host has visible interlocking mineral grains typical of granite, commonly quartz, feldspar, and mica.
Formation & geological history
Quartz crystallizes from silica-rich fluids or magma; granite forms as magma cools slowly underground. The image alone does not establish the specimen’s age or exact formation history.
Uses & applications
Quartz is used in glass, electronics, and jewelry; granite is widely used as building and paving stone.
Geological facts
Quartz is abundant in Earth’s crust and is piezoelectric, producing an electrical charge under mechanical stress.
Field identification & locations
Look for hardness (quartz scratches glass), glassy luster, and lack of cleavage; granite typically shows distinct interlocking grains. Quartz and granite occur worldwide in continental crust and mountain belts.
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