metamorphic

Weathered quartz-rich metamorphic rock, likely quartzite

Quartzite, predominantly crystalline SiO₂, possibly micaceous or feldspathic

AI-generated identification · may be incorrect

Hardness about 7 Mohs; pale gray to tan, coarse granular texture, vitreous to dull luster, and little obvious cleavage. The blocky, resistant surface and sparkly quartz grains are consistent with quartzite, though the photograph cannot confirm mineral composition.

Identified September 5, 2026More metamorphic →

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At a glance

Common name: Weathered quartz-rich metamorphic rock, likely quartzite
Scientific name: Quartzite, predominantly crystalline SiO₂, possibly micaceous or feldspathic
Category: metamorphic
Identified: September 5, 2026
Method: Standard

AI Estimated Value

Approximately $0–$20 as an ordinary outdoor specimen; attractive polished or unusually patterned pieces may sell for $20–$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 quartz-rich sandstone was deeply buried and recrystallized during metamorphism, commonly during mountain-building; its exact geological age is indeterminate from the image. Weathering has roughened and stained the exposed surface.

Uses & applications

Used as crushed stone, aggregate, landscaping rock, building stone, and occasionally decorative slabs; this specimen has little apparent gem or collector value.

Geological facts

Quartzite commonly breaks across grains rather than around them, unlike sandstone, and can be harder than a steel knife. The rock may contain minor mica, feldspar, iron oxides, or original sedimentary layers.

Field identification & locations

Likely found in metamorphic mountain belts, glacial deposits, or stream gravels. Test with a steel knife—quartzite should resist scratching—and inspect a fresh break for interlocking quartz grains; a definitive ID requires a close examination or thin section.