mineral

Milky quartz

Quartz (SiO₂), likely massive vein quartz

AI-generated identification · may be incorrect

White to translucent, glassy-to-dull luster, irregular fracture, and no obvious cleavage; Mohs hardness 7, hexagonal crystal system, specific gravity about 2.65. The specimen appears to be a small, naturally broken or worn piece with brown surface staining.

Identified September 26, 2026More mineral →

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Physical properties

Formation & geological history

Quartz commonly crystallizes from silica-rich fluids in fractures and veins, often during late stages of igneous activity or metamorphism; its age depends on the host geology. “100g branca” suggests a 100-gram white specimen, consistent with the photo.

Uses & applications

Commonly collected or used as decorative stone and in carvings; clear, high-purity quartz has industrial uses in electronics and optics, though this cloudy piece is unlikely to be gem-grade.

Geological facts

Quartz is one of Earth’s most abundant minerals and is resistant to weathering, so it often accumulates in stream gravels and soils.

Field identification & locations

Identify by its white translucence, glassy fracture, lack of cleavage, and ability to scratch ordinary glass. Found worldwide in veins and river deposits; the photo alone cannot establish a precise locality or distinguish vein quartz from a quartz-rich rock.