Pink Quartzite

Physical Properties

Hardness: 7 (Mohs scale), Color: Pink to reddish-brown (likely due to iron oxide impurities), Luster: Vitreous to dull, Crystal Structure: Hexagonal (microcrystalline), Cleavage: Indistinct/Conchoidal fracture, Specific Gravity: 2.6-2.65

Formation & Geological History

Formed through the regional metamorphism of quartz-rich sandstone. Under intense heat and pressure, original quartz grains recrystallize and fuse into a dense, crystalline mass. It is found in mountain belts and Precambrian shield areas worldwide.

Uses & Applications

Used as a decorative stone in landscaping, a durable construction aggregate, road ballast, and occasionally as a source of high-purity silica for glassmaking. Dense pieces are sometimes used for carvings.

Geological Facts

Quartzite is so tough that it often outlasts the rocks around it, resulting in prominent ridges or hills. It is often confused with marble, but can be distinguished by its inability to be scratched by a steel knife and its lack of reaction to acid.

Field Identification & Locations

Identify by its sugary texture on fresh breaks and its extreme hardness (grains do not rub off like sandstone). Commonly found in areas with ancient tectonic activity. For collectors, look for uniform color and lack of heavy fracturing.

Identified on: 4/29/2026

Mode: Standard