metamorphic

Quartzite with Quartz Vein

Metamorphosed Quartz-rich Sandstone (SiO2)

AI-generated identification · may be incorrect

Hardness: 7 on Mohs scale; Color: Tan, cream, and grey; Luster: Dull to vitreous; Crystal structure: Non-foliated, granular; Cleavage: None (conchoidal fracture)

Hardness: 7 on Mohs scale
Color: Tan, cream, and grey
Luster: Dull to vitreous

Identified July 16, 2026More metamorphic →

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Physical properties

Hardness: 7 on Mohs scale; Color: Tan, cream, and grey; Luster: Dull to vitreous; Crystal structure: Non-foliated, granular; Cleavage: None (conchoidal fracture)

Formation & geological history

Formed from the metamorphism of quartz sandstone under high heat and pressure, causing recrystallization of quartz grains. The vein indicates a later stage of hydrothermal activity where silica-rich fluids filled a fracture.

Uses & applications

Primarily used as crushed stone for road construction and railway ballast; higher quality specimens are used for architectural stone and countertops.

Geological facts

Quartzite is so tough that it often outlasts the surrounding rock in weathering processes, frequently forming the tops of ridges and resistant hills.

Field identification & locations

Identified by its extreme hardness (cannot be scratched by steel) and lack of foliation. Commonly found in mountain belts where tectonic forces have compressed sedimentary layers.