metamorphic

Quartz-rich metamorphic rock, likely quartzite or quartz vein in schist

Quartz (SiO₂) with probable mica, feldspar, and iron-oxide staining

AI-generated identification · may be incorrect

White to gray, coarse sugary texture with vitreous sparkling luster; quartz hardness ~7 Mohs, no cleavage, conchoidal fracture, and specific gravity ~2.65. Dark foliated margins likely contain biotite or graphite, while yellow-brown areas are iron oxides or weathering products.

Identified September 8, 2026More metamorphic →

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At a glance

Common name: Quartz-rich metamorphic rock, likely quartzite or quartz vein in schist
Scientific name: Quartz (SiO₂) with probable mica, feldspar, and iron-oxide staining
Category: metamorphic
Identified: September 8, 2026
Method: Standard

AI Estimated Value

Typically $5-$30 for a hand specimen; unusually attractive crystalline or locality-labeled pieces may sell for $30-$100.

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

Likely formed when quartz-rich sediment or a silica vein recrystallized during regional metamorphism, with later oxidation producing the brown-yellow staining. Exact age cannot be determined from the image; such rocks occur in Precambrian to younger metamorphic terranes.

Uses & applications

Quartzite is used as crushed stone, building stone, aggregate, and occasionally as a decorative slab; attractive quartz specimens may be collected but are generally not gem-quality.

Geological facts

The pale granular portion should scratch glass, whereas dark mica-rich material may be softer and flaky. The specimen appears natural and unpolished, with a quartz-rich central zone bordered by darker metamorphic rock.

Field identification & locations

Common in mountain belts and metamorphic terrains worldwide, including the Appalachians, Rocky Mountains, Scandinavia, India, and Brazil. Confirm by testing hardness, checking for mica foliation, and using acid: quartzite does not fizz with dilute hydrochloric acid.