metamorphic

Quartz-rich rock, possibly milky quartz or quartzite

Quartz (SiO₂); if quartzite, recrystallized quartz sandstone

AI-generated identification · may be incorrect

The specimen appears pale white to tan, granular, and weakly translucent with a glassy to dull luster. Quartz has Mohs hardness 7, no cleavage, conchoidal fracture, and a trigonal crystal structure; quartzite is very hard and compact.

Identified September 4, 2026More metamorphic →

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Physical properties

Formation & geological history

Milky quartz forms from silica-rich hydrothermal fluids, while quartzite forms when sandstone is metamorphosed and recrystallized. Precise age and identification require a sharper image or testing.

Uses & applications

Used as aggregate, construction stone, silica source, and ornamental material; attractive quartz pieces may be collected but are usually low value.

Geological facts

Quartz is one of Earth’s most abundant minerals and commonly forms veins cutting through igneous, metamorphic, and sedimentary rocks.

Field identification & locations

Test with a steel file or knife: genuine quartz should resist scratching; it will scratch glass. Look for a granular fused texture to distinguish quartzite from a single quartz crystal; common worldwide, especially in vein systems and metamorphic terrains.