mineral
Likely raw quartz-bearing stone, possibly greenish quartz or calcite
Uncertain from photograph; possible quartz (SiO₂) or calcite (CaCO₃)
AI-generated identification · may be incorrectPale gray-green, translucent, rough granular surface with vitreous to dull luster. Quartz hardness is 7 with no cleavage; calcite hardness is 3 and shows prominent rhombohedral cleavage; specific gravity is about 2.65–2.71.
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Physical properties
Pale gray-green, translucent, rough granular surface with vitreous to dull luster. Quartz hardness is 7 with no cleavage; calcite hardness is 3 and shows prominent rhombohedral cleavage; specific gravity is about 2.65–2.71.
Formation & geological history
Likely formed in a hydrothermal vein or metamorphic rock, where mineral-rich fluids deposited crystals in fractures; exact age and setting cannot be determined visually.
Uses & applications
Common quartz is used in glass, ceramics, electronics, and construction aggregate; calcite is used for cement, lime, and stone. Ordinary fragments generally have little commercial or jewelry value.
Geological facts
The specimen appears to contain multiple translucent grains and possible iron- or clay-stained areas, but the image is insufficient for reliable species identification.
Field identification & locations
Test hardness against a steel knife or glass, inspect cleavage, and apply dilute vinegar: calcite may fizz, whereas quartz will not. Common sources include hydrothermal veins and metamorphic terrains worldwide.
