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 incorrect

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.

Identified September 20, 2026More mineral →

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Physical properties

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.