mineral

Quartz (Milky Quartz with Iron Staining)

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: White to off-white with yellow/orange iron staining; Luster: Vitreous to greasy; Crystal Structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Hardness: 7 on Mohs scale
Color: White to off-white with yellow/orange iron staining
Luster: Vitreous to greasy

Identified June 27, 2026More mineral →

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Physical properties

Formation & geological history

Formed through the cooling of silica-rich magma or from hydrothermal veins. The orange staining is caused by secondary oxidation of iron minerals (limonite or hematite) within cracks.

Uses & applications

Used in glassmaking, abrasives, electronics (piezoelectric properties), and as decorative landscaping stone.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Its name comes from the German word 'Quarz', which has Slavic origins meaning 'hard'.

Field identification & locations

Identify by its ability to scratch glass and lack of cleavage. Look for the characteristic conchoidal (shell-like) fracture patterns on broken surfaces. Found worldwide in nearly all geological environments.

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Mineral/Rock

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