mineral

Milky quartz in iron-stained host rock

Quartz (SiO₂), likely with iron-oxide staining; host rock is uncertain from the photo

AI-generated identification · may be incorrect

Quartz has Mohs hardness 7, a vitreous luster, and no cleavage; it commonly forms irregular or hexagonal crystals. The specimen shows translucent white-gray quartz with brown, rusty staining and a rough matrix.

Identified September 30, 2026More mineral →

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Physical properties

Formation & geological history

Quartz commonly crystallizes from silica-rich fluids in fractures and veins; iron oxides can stain it during later weathering. The image does not establish the host rock or geological age.

Uses & applications

Quartz is used in glass, electronics, and abrasives; attractive pieces are collected or used decoratively. This rough specimen appears primarily of collecting interest.

Geological facts

Quartz is one of Earth’s most abundant minerals and occurs in many rock types and geological settings.

Field identification & locations

Look for glassy luster, hardness sufficient to scratch ordinary glass, and lack of cleavage; a white streak is typical. Quartz is widespread worldwide, especially in veins and pegmatites; confirm identification with hardness and streak tests.