metamorphic

Weathered metamorphic rock, possibly schist or gneiss

Indeterminate; likely quartz–feldspar–mica rock, potentially greenschist or gneiss

AI-generated identification · may be incorrect

Gray-green, coarse-grained, irregularly foliated, with dull to glassy patches likely quartz and feldspar and darker mica/amphibole. Typical hardness is about 5–7 Mohs; cleavage may occur in mica, but the image is insufficient for precise identification.

Identified August 31, 2026More metamorphic →

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At a glance

Common name: Weathered metamorphic rock, possibly schist or gneiss
Scientific name: Indeterminate; likely quartz–feldspar–mica rock, potentially greenschist or gneiss
Category: metamorphic
Identified: August 31, 2026
Method: Standard

AI Estimated Value

About $1–$10 for a common hand specimen; potentially $10–$30 if unusually attractive, locality-labeled, or demonstrably mineral-rich.

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 preexisting sedimentary or igneous rock underwent elevated heat and pressure, producing recrystallization and foliation. Its geological age cannot be determined from the photograph; such rocks range from Precambrian to recent mountain-building settings.

Uses & applications

Similar material is used locally as crushed stone, aggregate, landscaping rock, and sometimes dimension stone; an ordinary weathered specimen has little jewelry value.

Geological facts

The green coloration may reflect chlorite, epidote, or amphibole, while rusty areas likely represent iron-oxide weathering. A stronger identification requires a fresh surface, hand lens, streak, hardness, and acid tests.

Field identification & locations

Look for aligned flaky minerals or compositional banding, which distinguish schist or gneiss from massive igneous rocks; common settings include mountain belts and metamorphic terrains worldwide.