mineral

Quartz crystal with iron-oxide staining

Quartz (SiO₂), likely iron-stained or included quartz

AI-generated identification · may be incorrect

Hardness 7; translucent to transparent colorless-gray body with reddish-brown surface staining/inclusions; vitreous luster and conchoidal fracture. Quartz is trigonal and lacks cleavage; the specimen appears naturally broken or partially worn rather than a complete crystal.

Identified September 4, 2026More mineral →

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Physical properties

Formation & geological history

Quartz commonly forms in hydrothermal veins, cavities, and pegmatites as silica-rich fluids cool; reddish coloration comes from hematite or limonite. The photograph alone cannot establish a precise geological age.

Uses & applications

Common quartz is used in glass, ceramics, abrasives, electronics, and engineered stone; attractive crystals are collected or used decoratively, but this piece appears to have little jewelry value.

Geological facts

Iron oxides can coat or infiltrate quartz fractures, producing red, orange, or brown color. Quartz is one of Earth’s most abundant and chemically durable minerals.

Field identification & locations

Look for glassy luster, hardness sufficient to scratch ordinary steel or glass, no cleavage, and conchoidal fracture; a streak test should be white. Common worldwide, especially in hydrothermal veins and pegmatites.