metamorphic

Quartz-rich metamorphic pebble, possibly quartzite

Quartzite (microcrystalline quartz, SiO₂), with possible iron-oxide staining and minor mica or feldspar

AI-generated identification · may be incorrect

Hardness about 7 Mohs; pale gray to silvery-white, granular texture, vitreous to slightly dull luster, and no obvious cleavage. The rounded shape indicates stream or beach abrasion; metallic-looking sparkles may be quartz or mica, not necessarily metal.

Identified September 17, 2026More metamorphic →

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At a glance

Common name: Quartz-rich metamorphic pebble, possibly quartzite
Scientific name: Quartzite (microcrystalline quartz, SiO₂), with possible iron-oxide staining and minor mica or feldspar
Category: metamorphic
Identified: September 17, 2026
Method: Standard

AI Estimated Value

Typically $2–$15 for a small common pebble; roughly $20–$75 for an attractive, unusually sparkly, or provenance-documented specimen.

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

Quartzite forms when quartz-rich sandstone is recrystallized under heat and pressure during metamorphism, commonly during mountain-building events; its exact age cannot be determined from the image. The specimen was later rounded by transport in water or sediment.

Uses & applications

Used as durable crushed stone, aggregate, road material, and decorative stone; attractive pieces are collected as natural or polished specimens. It is generally not a jewelry gemstone unless exceptionally clean and colorful.

Geological facts

Quartzite commonly breaks across grains rather than around them and can be harder and more resistant than the sandstone from which it formed. A streak test should be white, and dilute acid should produce no fizz.

Field identification & locations

Common in metamorphic mountain belts and gravel deposits worldwide, including the Appalachians, Rocky Mountains, Alps, and Scandinavian shield. Confirm with a hardness test: it should scratch ordinary glass; inspect for interlocking quartz grains and test any glittering areas for mica flakes.