metamorphic

Quartzite (possibly iron-stained brecciated quartzite)

Quartz-rich metamorphic rock; chiefly SiO₂ with iron-oxide staining and minor accessory minerals

AI-generated identification · may be incorrect

Typically very hard (Mohs 7), pale pink to cream with reddish-brown inclusions, vitreous to sugary luster, and interlocking quartz grains; generally lacks cleavage and breaks irregularly. The specimen appears rounded and water-worn, with possible brecciation or iron-rich vein material.

Identified August 15, 2026More metamorphic →

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At a glance

Common name: Quartzite (possibly iron-stained brecciated quartzite)
Scientific name: Quartz-rich metamorphic rock; chiefly SiO₂ with iron-oxide staining and minor accessory minerals
Category: metamorphic
Identified: August 15, 2026
Method: Standard

AI Estimated Value

About $1–$10 as a common natural cobble; $10–$50 if unusually attractive, polished, or demonstrably collectible.

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 recrystallized under elevated heat and pressure, commonly during mountain building; its exact geological age cannot be determined from the image. Red coloration likely reflects hematite or other iron oxides.

Uses & applications

Used as durable aggregate, building and paving stone, landscape rock, and occasionally as a decorative lapidary material. Attractive patterned pieces may be polished for display.

Geological facts

Quartzite resists weathering and commonly forms ridges or resistant stream gravels. It can resemble massive quartz, but its granular interlocking texture distinguishes it from a single quartz crystal.

Field identification & locations

Identify it by its strong resistance to scratching, granular sugary texture, and lack of obvious cleavage; a steel file should not easily scratch it. Common in metamorphic mountain belts worldwide, including the Appalachians, Rocky Mountains, and Precambrian shields.