mineral

Quartz (Common or Milky Quartz) with Iron Staining

Silicon Dioxide (SiO2)

AI-generated identification · may be incorrect

Hardness: 7 on Mohs scale; Color: Translucent white to peach/orange; Luster: Vitreous (glassy) to greasy; Crystal Structure: Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Hardness: 7 on Mohs scale
Color: Translucent white to peach/orange
Luster: Vitreous (glassy) to greasy

Identified July 19, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Translucent white to peach/orange; Luster: Vitreous (glassy) to greasy; Crystal Structure: Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Formation & geological history

Quartz forms in a wide variety of environments, most commonly from the cooling of silica-rich magma or through hydrothermal activity where mineral-rich water fills veins and cavities. The orange tint is caused by trace inclusions of hematite or limonite (iron oxides).

Uses & applications

Commonly used in glassmaking, electronics (as a piezoelectric material), jewelry (as semi-precious stones), and as an abrasive in sandpaper.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. It is highly resistant to chemical and physical weathering, which is why it is often found as smooth pebbles in riverbeds or on beaches.

Field identification & locations

Identify in the field by its hardness (it will scratch glass) and lack of cleavage. This specific specimen is a water-worn or weathered pebble likely found in a river or gravel deposit. Look for translucent, waxy surfaces.