mineral

Iron-stained quartz (likely quartzite or quartz-rich rock)

Quartz, silicon dioxide (SiO₂), with iron-oxide staining

AI-generated identification · may be incorrect

Hardness about 7 Mohs; translucent honey-brown to gray, with a vitreous to dull luster and irregular fracture. The granular, massive texture suggests quartz-rich rock rather than a single well-formed crystal; cleavage is absent, and specific gravity is about 2.65.

Identified August 8, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich fluids or igneous melts; reddish-brown coloration commonly comes from hematite or limonite coatings and inclusions. The specimen’s exact geological age and host rock cannot be determined from the image.

Uses & applications

Common quartz is used in glass, ceramics, abrasives, engineered stone, and electronics; attractive pieces are sold as inexpensive mineral specimens. It has little gem value unless unusually clear or well crystallized.

Geological facts

Quartz is one of Earth’s most abundant minerals and is highly resistant to weathering, making it common in sand and sedimentary deposits.

Field identification & locations

Identify it by its glassy appearance, lack of cleavage, and ability to scratch ordinary glass; iron staining produces the warm yellow-brown color. Common worldwide, especially in hydrothermal veins, granites, quartzites, and weathered rocks.