mineral
Unidentified pale mineral fragment
Likely quartz or calcite; image resolution prevents confident identification
AI-generated identification · may be incorrectWhitish, translucent-to-opaque fragment with a dull to glassy luster and irregular fracture. Quartz has Mohs hardness 7 and no cleavage; calcite has hardness 3 and prominent rhombohedral cleavage, neither distinguishable here.
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Physical properties
Whitish, translucent-to-opaque fragment with a dull to glassy luster and irregular fracture. Quartz has Mohs hardness 7 and no cleavage; calcite has hardness 3 and prominent rhombohedral cleavage, neither distinguishable here.
Formation & geological history
Could be a naturally broken mineral specimen or fragment of a geological material; formation age and geological setting cannot be determined from the photograph.
Uses & applications
Quartz is used in glass, electronics, abrasives, and jewelry; calcite is used in cement, lime, construction aggregate, and decorative stone. A small unidentified fragment has little commercial value.
Geological facts
The key distinction is hardness: quartz scratches glass, while calcite is easily scratched with a steel knife and fizzes in dilute hydrochloric acid.
Field identification & locations
Test safely on an inconspicuous edge: inspect cleavage, try a glass-scratch test, and apply vinegar or dilute acid only if calcite is suspected. Common sources include quartz veins, limestone, and gravel deposits.
