mineral
Quartz-rich rock, possibly milky quartz or quartzite fragment
Quartz (SiO₂), potentially quartzite if metamorphic
AI-generated identification · may be incorrectWhite to pale gray, opaque to translucent, with a dull-to-glassy luster and irregular fracture; quartz has Mohs hardness 7 and no cleavage. The image is insufficient to confirm grain texture or crystal structure, and the surface may be weathered or coated.
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Physical properties
White to pale gray, opaque to translucent, with a dull-to-glassy luster and irregular fracture; quartz has Mohs hardness 7 and no cleavage. The image is insufficient to confirm grain texture or crystal structure, and the surface may be weathered or coated.
Formation & geological history
Quartz forms in igneous, hydrothermal, sedimentary, and metamorphic settings; quartzite forms when quartz sandstone is recrystallized 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 ornamentally.
Geological facts
Quartz is one of Earth’s most abundant minerals and commonly develops conchoidal fracture. A steel knife should not scratch it, while quartz should scratch ordinary glass.
Field identification & locations
Likely identification requires a hardness test, streak test, acid test, and close inspection for interlocking grains or crystal faces. Common worldwide, especially in veins, sands, and metamorphic terrains.
