metamorphic

Quartz-rich metamorphic rock, likely mica schist or gneiss

Quartz–feldspar–mica metamorphic aggregate; exact identification requires thin-section or field tests

AI-generated identification · may be incorrect

Coarse-grained, irregularly foliated specimen with translucent white-gray quartz, pale feldspar, and dark green-gray mica or chlorite; vitreous quartz luster, Mohs hardness about 6–7, and no obvious cleavage in quartz-rich areas. The green coloration may reflect chlorite, epidote, or altered amphibole.

Identified September 9, 2026More metamorphic →

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At a glance

Common name: Quartz-rich metamorphic rock, likely mica schist or gneiss
Scientific name: Quartz–feldspar–mica metamorphic aggregate; exact identification requires thin-section or field tests
Category: metamorphic
Identified: September 9, 2026
Method: Standard

AI Estimated Value

About $5–$25 for a common hand specimen; attractive polished or provenance-documented 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

Formed when a quartz- and feldspar-bearing protolith was subjected to elevated temperature and pressure during regional metamorphism, commonly during mountain building. Its precise geological age cannot be determined from the photograph.

Uses & applications

Used locally as decorative or dimension stone, aggregate, and occasionally as a teaching or collection specimen; the pictured irregular piece has little jewelry value.

Geological facts

The apparent pink, white, and green patches suggest mineral segregation and alteration rather than a single pure mineral. A glassy scratch on quartz-rich grains and visible foliation help distinguish it from granite.

Field identification & locations

Likely examples occur in metamorphic belts worldwide, including Scandinavia, the Alps, the Appalachians, and many Precambrian shields. Check for foliation, a streakless surface, and hardness greater than ordinary steel; acid testing is generally unnecessary.