mineral

Quartz with Iron Oxide Inclusions

Silicon Dioxide (SiO2) with Hematite/Limonite

AI-generated identification · may be incorrect

Hardness 7 on Mohs scale, milky white to tan with reddish-brown surface iron staining, vitreous to dull luster, trigonal crystal structure, conchoidal fracture, specific gravity approximately 2.65.

Identified July 22, 2026More mineral →

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Physical properties

Hardness 7 on Mohs scale, milky white to tan with reddish-brown surface iron staining, vitreous to dull luster, trigonal crystal structure, conchoidal fracture, specific gravity approximately 2.65.

Formation & geological history

Formed through hydrothermal processes where silica-rich fluids crystallized in veins or cavities within country rock, later stained or coated with iron oxide (hematite or limonite) through secondary weathering.

Uses & applications

Commonly collected by hobbyists and rockhounds; higher grade specimens are used in lapidary work, cabochon cutting, or ornamental stone carving.

Geological facts

Quartz is one of the most abundant minerals in the Earth's continental crust. Iron oxide coatings give quartz specimens reddish, brownish, or yellowish tones, often leading them to be misidentified as jasper or agate.

Field identification & locations

Identified by its hardness (scratches glass), waxy to vitreous luster, and milky quartz interior bordered by reddish-brown iron crusts. Commonly found in gravel beds, stream deposits, and pegmatite veins worldwide.