metamorphic

Quartz / Quartzite

Silicon Dioxide (SiO2)

AI-generated identification · may be incorrect

Hardness: 7 on Mohs scale. Color: Grayish-white to translucent. Luster: Vitreous to greasy. Crystal System: Trigonal. Cleavage: None (conchoidal fracture). Specific Gravity: ~2.65.

Hardness: 7 on Mohs scale
Color: Grayish-white to translucent
Luster: Vitreous to greasy

Identified July 27, 2026More metamorphic →

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Physical properties

Hardness: 7 on Mohs scale. Color: Grayish-white to translucent. Luster: Vitreous to greasy. Crystal System: Trigonal. Cleavage: None (conchoidal fracture). Specific Gravity: ~2.65.

Formation & geological history

Formed from the metamorphism of quartz-rich sandstone under intense heat and pressure, or precipitated as vein quartz in hydrothermal systems.

Uses & applications

Used in construction as crushed stone, in decorative landscaping, and as a source of silica for glass manufacturing.

Geological facts

Quartzite is extremely durable and resistant to chemical weathering, often forming prominent ridge tops and hills due to its hardness.

Field identification & locations

Identified by its high hardness (scratches glass easily), lack of cleavage, and sugary or crystalline texture. Found widely across continental crusts.