metamorphic

Orange Quartzite

Quartzite (primarily SiO2 with hematite or iron oxide inclusions)

AI-generated identification · may be incorrect

Hardness: 7 on Mohs scale; Color: Orange to reddish-pink; Luster: Vitreous to waxy; Crystal structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific gravity: 2.63–2.65.

Hardness: 7 on Mohs scale
Color: Orange to reddish-pink
Luster: Vitreous to waxy

Identified June 20, 2026More metamorphic →

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Physical properties

Formation & geological history

Formed through the metamorphism of quartz-rich sandstone under intense heat and pressure, causing quartz grains to recrystallize and fuse. The orange hue is typically due to iron oxide staining during or after formation.

Uses & applications

Used as decorative stone in landscaping, jewelry (as tumbled stones or cabochons), construction aggregate, and in glassmaking if pure enough.

Geological facts

Quartzite is so tough that it often outlasts the surrounding rocks during erosion, often forming the caps of hills and ridges. It is harder than steel and can scratch glass easily.

Field identification & locations

Identify in the field by its sugary texture on broken surfaces and its extreme hardness (cannot be scratched by a knife). Commonly found in ancient mountain belts and glacial till.