metamorphic

Weathered quartz-rich metamorphic rock, likely milky quartz or quartzite

Quartz (SiO₂), possibly quartzite with iron-oxide staining and dark inclusions

AI-generated identification · may be incorrect

Hardness about 7 Mohs; pale gray to cream with translucent milky areas, dark gray inclusions, vitreous to dull weathered luster, and irregular fracture rather than obvious cleavage. The rounded, abraded surface suggests natural weathering or stream transport.

Identified September 21, 2026More metamorphic →

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At a glance

Common name: Weathered quartz-rich metamorphic rock, likely milky quartz or quartzite
Scientific name: Quartz (SiO₂), possibly quartzite with iron-oxide staining and dark inclusions
Category: metamorphic
Identified: September 21, 2026
Method: Standard

AI Estimated Value

About $1–$15 for a common field specimen; $20–$75 if unusually attractive, crystalline, or strongly patterned.

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

If quartzite, it formed when quartz-rich sandstone recrystallized under metamorphic pressure and heat, commonly during Precambrian to Paleozoic mountain building; a pure quartz specimen may instead be hydrothermal. Common in metamorphic terrains, veins, and glacial or stream gravels.

Uses & applications

Quartzite is used as crushed stone, aggregate, building stone, and sometimes decorative material; attractive quartz specimens are collected but are usually inexpensive.

Geological facts

Quartz is one of Earth’s most abundant minerals and is resistant to chemical and physical weathering, allowing quartz-rich cobbles to persist after softer minerals erode.

Field identification & locations

Look for glassy/translucent quartz grains, very high hardness, and the ability to scratch ordinary glass; quartzite commonly shows fused grains and a sugary texture. Exact identification would benefit from a fresh break, streak, and acid test.