metamorphic

Iron-stained quartz-rich rock, likely quartzite

Quartzite; predominantly microcrystalline quartz (SiO₂) with iron-oxide minerals such as goethite and hematite

AI-generated identification · may be incorrect

Typically Mohs hardness 7, white to gray with rusty yellow-brown staining, vitreous to sugary luster, and interlocking quartz grains with little or no cleavage. The rounded surface suggests natural abrasion or a tumbled specimen.

Identified September 10, 2026More metamorphic →

Explore Iron-stained quartz-rich rock, likely quartzite in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

At a glance

Common name: Iron-stained quartz-rich rock, likely quartzite
Scientific name: Quartzite; predominantly microcrystalline quartz (SiO₂) with iron-oxide minerals such as goethite and hematite
Category: metamorphic
Identified: September 10, 2026
Method: Standard

AI Estimated Value

About $5–$20 for a common hand specimen; $20–$60 if unusually attractive, polished, or locality-documented.

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 subjected to heat and pressure, recrystallizing into quartzite; iron-bearing fluids later produced the ochre staining. Its exact geological age and locality cannot be determined from the image.

Uses & applications

Used as durable aggregate, building stone, paving, and countertops; attractive pieces are collected as decorative specimens. It is generally not gem-grade.

Geological facts

Quartzite commonly breaks across grains rather than around them and can scratch ordinary glass. The rusty colors reflect oxidation of iron minerals, not necessarily a separate ore deposit.

Field identification & locations

Identify it by hardness, quartz-rich granular texture, and lack of obvious feldspar or mica; vinegar will not fizz unless carbonate minerals are present. Common in metamorphic mountain belts worldwide.