metamorphic

Quartz-rich metamorphic rock (probable quartzite)

Quartzite; predominantly microcrystalline quartz (SiO₂), possibly with mica and iron-oxide impurities

AI-generated identification · may be incorrect

Hardness about 7 Mohs; pale gray to tan, granular and weakly foliated appearance, with vitreous to dull luster. Quartzite lacks obvious cleavage and commonly breaks along irregular or conchoidal fractures; the specimen appears weathered and iron-stained.

Identified September 12, 2026More metamorphic →

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At a glance

Common name: Quartz-rich metamorphic rock (probable quartzite)
Scientific name: Quartzite; predominantly microcrystalline quartz (SiO₂), possibly with mica and iron-oxide impurities
Category: metamorphic
Identified: September 12, 2026
Method: Standard

AI Estimated Value

About $1–$10 for a common loose specimen; attractive polished or locality-documented pieces may sell for $10–$50.

Not an official valuation

AI estimate for general interest only — not an appraisal. Actual value depends on condition, provenance, and market demand. Verify with a professional before buying, selling, or insuring.

This identification was generated by AI and may contain errors. Verify important details before relying on them — and never use an AI result to judge whether a specimen is safe to handle. Read the full disclaimer

Physical properties

Formation & geological history

Forms when quartz-rich sandstone is recrystallized under elevated pressure and temperature during regional metamorphism. Precise age cannot be determined from the photograph; it may range from Precambrian to much younger depending on its host terrain.

Uses & applications

Used as durable crushed stone, aggregate, road material, dimension stone, and occasionally countertops or decorative specimens. This rough fragment has little jewelry value.

Geological facts

Quartz grains commonly interlock during metamorphism, making quartzite more resistant to weathering than the original sandstone. The surrounding outcrop also appears quartz-rich and may contain minor mica or sulfide staining.

Field identification & locations

Identify it by its extreme hardness, abundant visible quartz grains, lack of clay-like softness, and inability to scratch it with a steel knife; quartz should scratch glass. Common in metamorphic mountain belts worldwide.