mineral

Iron-stained milky quartz cluster

Quartz (SiO₂), with brown iron-oxide staining

AI-generated identification · may be incorrect

Mostly opaque white to translucent quartz with a vitreous luster and irregular fracture; Mohs hardness 7, trigonal crystal structure, no cleavage, specific gravity about 2.65. The image does not show enough detail to identify distinct crystal faces confidently.

Identified September 27, 2026More mineral →

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Physical properties

Formation & geological history

Quartz commonly crystallizes from silica-rich hydrothermal fluids or late-stage cavities in igneous and metamorphic rocks; iron oxides stained the exposed surface. Its age cannot be determined from the photograph.

Uses & applications

Quartz is used in glass, electronics, and ornamental objects; this rough cluster is mainly suitable for display or collecting.

Geological facts

Quartz is one of Earth’s most abundant minerals and is notably resistant to weathering.

Field identification & locations

Look for hardness near 7, glassy luster, and lack of cleavage; the brown coating is likely iron staining. Quartz occurs worldwide, including in veins, pegmatites, and geodes.