mineral

Milky quartz (likely quartz fragment)

Quartz, silicon dioxide (SiO₂)

AI-generated identification · may be incorrect

White to translucent, vitreous-to-waxy luster, irregular conchoidal fracture, no obvious cleavage; Mohs hardness 7 and specific gravity about 2.65. The rough fragment appears massive rather than a distinct crystal.

Identified August 17, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids crystallize in veins, cavities, and igneous or metamorphic rocks; specimens may range from Precambrian to recent geological settings. The pictured piece is likely a naturally broken quartz fragment.

Uses & applications

Used in glass, ceramics, foundry sand, electronics, abrasives, and engineered stone; attractive pieces are collected but this specimen is not gem quality.

Geological facts

Quartz is one of Earth’s most abundant minerals and commonly produces a white translucent variety called milky quartz. Its lack of cleavage and glassy fracture distinguish it from calcite and many feldspars.

Field identification & locations

Common worldwide, including Brazil, the United States, Madagascar, and Alpine regions. Check that it scratches ordinary glass but not steel easily; vinegar will not visibly react, unlike calcite.