metamorphic

Tumbled quartz-rich rock, likely quartzite

Quartzite; predominantly microcrystalline quartz (SiO₂), possibly with feldspar and iron-oxide staining

AI-generated identification · may be incorrect

Hardness about 7 Mohs; cream, tan, pink, and brown coloration with a dull-to-glassy luster and granular, massive texture. No obvious cleavage; rounded and glossy from tumbling, with possible iron-oxide veins or weathering pits.

Identified September 11, 2026More metamorphic →

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At a glance

Common name: Tumbled quartz-rich rock, likely quartzite
Scientific name: Quartzite; predominantly microcrystalline quartz (SiO₂), possibly with feldspar and iron-oxide staining
Category: metamorphic
Identified: September 11, 2026
Method: Standard

AI Estimated Value

About $1-$10 for a common tumbled piece; approximately $10-$30 if unusually patterned, polished, or sold as a decorative 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 in Precambrian to younger mountain belts. The smooth shape and wet appearance indicate human tumbling or polishing rather than natural crystal faces.

Uses & applications

Used as durable aggregate, paving and building stone, landscaping material, and decorative tumbled stone; attractive pieces may be sold for lapidary or collection purposes.

Geological facts

Quartzite commonly breaks across quartz grains rather than around them and can scratch ordinary glass. The brown coloration likely comes from hematite or limonite inclusions.

Field identification & locations

Look for a very hard, quartz-like surface, sugary granular texture, and resistance to scratching by steel; acid produces no reaction. Common in metamorphic mountain regions and stream gravels worldwide.