mineral
Milky quartz (likely)
Quartz, SiO₂
AI-generated identification · may be incorrectWhite, opaque, rough fragment with a vitreous-to-dull luster; quartz has Mohs hardness 7, a trigonal crystal structure, no cleavage, and conchoidal fracture. The image alone cannot confirm the identification; calcite is another possibility.
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Physical properties
White, opaque, rough fragment with a vitreous-to-dull luster; quartz has Mohs hardness 7, a trigonal crystal structure, no cleavage, and conchoidal fracture. The image alone cannot confirm the identification; calcite is another possibility.
Formation & geological history
Quartz forms when silica crystallizes from cooling magma or precipitates from hot fluids, commonly in veins and igneous or metamorphic rocks. Its age depends on the host deposit and cannot be determined from the image.
Uses & applications
Quartz is used in glassmaking, electronics, abrasives, and decorative stones; common milky quartz fragments have little jewelry value.
Geological facts
A useful field test is hardness: quartz scratches glass and does not fizz in dilute acid; calcite is softer and fizzes.
Field identification & locations
Milky quartz is widespread in veins and many rock types worldwide. This small, unpolished fragment appears ordinary; confirm with hardness and cleavage tests before labeling.
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