mineral

Quartz (rough, iron-stained specimen)

Quartz, silicon dioxide (SiO₂)

AI-generated identification · may be incorrect

Hardness 7 Mohs; translucent to whitish with yellow-brown staining and a vitreous luster. Quartz has a trigonal crystal structure and no cleavage, breaking with uneven or conchoidal fracture; the image alone does not establish specific gravity.

Identified October 10, 2026More mineral →

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Physical properties

Formation & geological history

Likely crystallized from silica-rich fluids or melt in a vein or cavity; quartz forms across many geological ages and settings. The brown-yellow areas may be iron-oxide staining.

Uses & applications

Quartz is used in glassmaking, electronics, abrasives, and as a gemstone; this small rough piece is mainly suitable for collecting or identification.

Geological facts

Quartz is one of Earth’s most abundant minerals and is a major component of many rocks.

Field identification & locations

Look for glassy luster, hardness sufficient to scratch ordinary glass, and lack of cleavage; common worldwide in veins, pegmatites, and sedimentary rocks. The specimen’s appearance is consistent with quartz, though a photo cannot confirm identification.