mineral
Likely quartz-rich stone, possibly quartzite or milky quartz
Quartz (silicon dioxide, SiO₂); exact rock identification is uncertain from the image
AI-generated identification · may be incorrectWhite to gray, dull-to-glassy luster, massive and granular with no obvious cleavage; quartz hardness is Mohs 7 and specific gravity is about 2.65. The rounded, weathered surface may indicate a quartz pebble or quartzite fragment.
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Physical properties
White to gray, dull-to-glassy luster, massive and granular with no obvious cleavage; quartz hardness is Mohs 7 and specific gravity is about 2.65. The rounded, weathered surface may indicate a quartz pebble or quartzite fragment.
Formation & geological history
Quartz forms in igneous, metamorphic, and hydrothermal environments; quartzite forms when sandstone recrystallizes during metamorphism. Its age cannot be determined from the photograph.
Uses & applications
Common quartz is used in glass, ceramics, abrasives, electronics, and construction aggregate; attractive pieces are collected or used decoratively, but this specimen appears low-grade.
Geological facts
Quartz is one of Earth’s most abundant minerals and has a distinctive conchoidal fracture rather than cleavage. White “milky” quartz gets its opacity from microscopic fluid inclusions or fractures.
Field identification & locations
Found widely in veins, stream gravels, pegmatites, and quartz-rich metamorphic rocks. A glass-scratch test, lack of cleavage, and translucent edges support quartz; acid testing is unnecessary.
