mineral

Milky quartz (massive quartz)

Quartz, silicon dioxide (SiO₂)

AI-generated identification · may be incorrect

White to translucent, vitreous-to-greasy luster, generally massive rather than visibly crystalline; Mohs hardness 7, no cleavage, conchoidal fracture, and specific gravity about 2.65. The rough, granular surface and pale color are consistent with quartz, though a photo cannot exclude calcite or feldspar.

Identified September 16, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids crystallize in veins, cavities, and pegmatites, or when quartz grains recrystallize in metamorphic rocks. Quartz is common from Precambrian through modern geological settings.

Uses & applications

Used for glass, ceramics, foundry sand, abrasives, electronics, and engineered stone; attractive translucent pieces are collected or occasionally cut as cabochons.

Geological facts

Quartz is one of Earth’s most abundant minerals and has strong piezoelectric properties. It commonly occurs with feldspar, mica, and metallic ore minerals.

Field identification & locations

Check for hardness: it should scratch ordinary glass but not be scratched by a steel knife; it does not fizz in dilute hydrochloric acid, unlike calcite. Common worldwide, especially in quartz veins, granite pegmatites, and metamorphic terrains.