metamorphic
Milky quartz-bearing rock, likely quartzite or silicified limestone
Quartz (SiO₂), possibly in a quartzite or chalcedony-rich matrix
AI-generated identification · may be incorrectWhite to pale gray, translucent edges, vitreous to waxy luster, massive granular texture with no obvious cleavage; quartz hardness is Mohs 7 and specific gravity about 2.65. The rough, weathered surface may include softer carbonate or clay minerals.
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Physical properties
White to pale gray, translucent edges, vitreous to waxy luster, massive granular texture with no obvious cleavage; quartz hardness is Mohs 7 and specific gravity about 2.65. The rough, weathered surface may include softer carbonate or clay minerals.
Formation & geological history
Likely formed through silica-rich metamorphism or replacement of an older sedimentary rock; exact age and origin cannot be determined from the photograph. Quartz veins and silicification commonly form in hydrothermal or burial-related environments.
Uses & applications
Quartzite is used as aggregate, building stone, and occasionally decorative material; attractive translucent pieces may be collected or polished. This specimen does not appear gem-quality.
Geological facts
The translucent, glassy portions are consistent with massive quartz or chalcedony, while the dull crumbly areas suggest weathered matrix minerals. A streak, acid, and hardness test would distinguish quartzite from calcite-rich limestone.
Field identification & locations
Common in quartz veins, metamorphic terrains, and silicified sedimentary outcrops worldwide. It should scratch ordinary glass, resist a steel nail, and show no reaction to dilute hydrochloric acid if predominantly quartz.
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