mineral
Quartz-rich rock, likely milky quartz or quartz vein fragment
Quartz (silicon dioxide, SiO₂), possibly with minor feldspar or calcite
AI-generated identification · may be incorrectWhite to translucent, glassy-to-pearlescent luster, irregular fracture, and no obvious cleavage; quartz hardness is Mohs 7 and specific gravity about 2.65. The granular, pale appearance suggests a small vein fragment rather than a well-formed crystal.
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Physical properties
White to translucent, glassy-to-pearlescent luster, irregular fracture, and no obvious cleavage; quartz hardness is Mohs 7 and specific gravity about 2.65. The granular, pale appearance suggests a small vein fragment rather than a well-formed crystal.
Formation & geological history
Likely precipitated from silica-rich hydrothermal fluids filling a fracture, then exposed by weathering; quartz veins formed during many geological ages and settings. The image alone cannot establish its precise age or host rock.
Uses & applications
Quartz is used in glass, ceramics, abrasives, electronics, and engineered stone; attractive transparent pieces may be collected, though this specimen appears ordinary.
Geological facts
Quartz is one of Earth’s most abundant minerals and commonly forms veins cutting through older rocks. It can be distinguished from calcite because quartz is much harder and does not effervesce in dilute hydrochloric acid.
Field identification & locations
Common in quartz veins, granite, pegmatite, metamorphic rocks, and stream gravels worldwide. Test with a steel file or glass—quartz scratches glass—while avoiding acid unless calcite contamination is suspected.
