mineral

Milky quartz fragment

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

White to translucent, vitreous-to-waxy luster, irregular conchoidal fracture, and no obvious cleavage; Mohs hardness 7 and specific gravity about 2.65. The rough, jagged fragment is consistent with quartz, though the image alone cannot exclude calcite or another pale mineral.

Identified September 22, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich igneous and hydrothermal fluids and occurs widely in veins and pegmatites; specimens may range from ancient Precambrian rocks to modern formations. This piece appears naturally fractured rather than polished.

Uses & applications

Common quartz is used in glass, ceramics, abrasives, foundry sand, electronics, and construction aggregate; attractive crystals are collected or used ornamentally. This tiny, opaque fragment has little commercial value.

Geological facts

Quartz is one of Earth’s most abundant minerals and forms the defining component of many granites, sandstones, and quartz veins. Its hardness allows it to scratch ordinary glass and steel.

Field identification & locations

Look for glassy luster, hardness, lack of cleavage, and conchoidal fracture; a streak test is white, while vinegar or dilute acid should not fizz. Common worldwide, especially in granite terrains, hydrothermal veins, and river gravels.