mineral

Milky quartz fragment

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Typically white to translucent with a vitreous-to-waxy luster, conchoidal fracture, and no cleavage; Mohs hardness 7, trigonal crystal structure, specific gravity about 2.65. The specimen appears massive and milky, possibly with minor iron staining or surface weathering.

Identified September 16, 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; its age depends on the host deposit, commonly Paleozoic to Mesozoic or younger. Milky appearance results from microscopic fluid inclusions and fractures.

Uses & applications

Used as a silica source for glass, ceramics, abrasives, and engineered stone; attractive pieces are collected but this fragment is not gem quality.

Geological facts

Quartz is among Earth’s most abundant minerals and is resistant to weathering, making it common in stream gravels and sandy sediments.

Field identification & locations

Identify it by its hardness—scratches ordinary glass—and lack of cleavage; it commonly occurs in quartz veins, granite, pegmatite, and metamorphic rocks worldwide. The pictured piece could also be a quartz-rich rock fragment, so exact identification requires testing.