metamorphic

Iron-stained quartzite or quartz-rich metamorphic rock

Quartzite; predominantly microcrystalline quartz (SiO₂), with iron-oxide staining and possible feldspar/mica impurities

AI-generated identification · may be incorrect

Hardness about 7 Mohs; tan, brown, reddish, and gray with a granular, sugary texture, vitreous to dull luster, and no obvious cleavage. Quartz grains appear fused, producing irregular fracture and high density (~2.6 g/cm³).

Identified September 2, 2026More metamorphic →

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At a glance

Common name: Iron-stained quartzite or quartz-rich metamorphic rock
Scientific name: Quartzite; predominantly microcrystalline quartz (SiO₂), with iron-oxide staining and possible feldspar/mica impurities
Category: metamorphic
Identified: September 2, 2026
Method: Standard

AI Estimated Value

$1–$10 for an ordinary hand specimen; approximately $10–$30 if unusually attractive or locality-labeled.

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 buried and recrystallized under heat and pressure, commonly during regional mountain-building; its exact geological age cannot be determined from the photograph.

Uses & applications

Used as crushed stone, aggregate, paving and building stone; attractive pieces may be collected or cut for ornamental work, though this specimen appears low-grade for jewelry.

Geological facts

Quartzite is more resistant to weathering than its sandstone precursor and commonly forms ridges or resistant outcrops.

Field identification & locations

Identify it by testing whether it scratches glass and by observing that grains are fused rather than loosely cemented; reddish-brown colors usually reflect hematite or limonite. Common worldwide, including the Appalachian Mountains, Rocky Mountains, and many Precambrian terrains.