mineral
Quartz-rich rock fragment, possibly milky quartz or quartzite
Quartz (SiO₂), or quartzite if the grains are fused
AI-generated identification · may be incorrectWhite to translucent, vitreous-to-dull luster, irregular/conchoidal fracture, and no obvious cleavage; quartz hardness is Mohs 7, with specific gravity about 2.65. The image is insufficient to confirm crystal structure or distinguish quartz from a pale quartzite fragment.
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Physical properties
White to translucent, vitreous-to-dull luster, irregular/conchoidal fracture, and no obvious cleavage; quartz hardness is Mohs 7, with specific gravity about 2.65. The image is insufficient to confirm crystal structure or distinguish quartz from a pale quartzite fragment.
Formation & geological history
Quartz crystallizes from silica-rich fluids or magma; quartzite forms when quartz sandstone is metamorphosed. Such material ranges from Precambrian to recent geological ages and occurs widely in igneous, metamorphic, and sedimentary environments.
Uses & applications
Quartz is used in glass, ceramics, electronics, abrasives, and countertops; quartzite is used as crushed stone, aggregate, building stone, and decorative material. Attractive transparent pieces may be collected, though this specimen appears ordinary.
Geological facts
The apparent sparkling or translucent areas may be quartz grains or cleavage-like fracture surfaces, but quartz itself lacks cleavage. A steel file should not scratch quartz; quartz can scratch ordinary glass.
Field identification & locations
Common in quartz veins, granite, sandstone, and metamorphic terrains worldwide. A close examination with a hand lens, hardness test, and acid test (to exclude calcite) would improve identification.
