metamorphic

Iron-stained quartz-rich rock (likely ferruginous quartzite)

Quartz-rich ferruginous rock, probably quartzite with iron-oxide staining (SiO₂ with hematite/goethite)

AI-generated identification · may be incorrect

Coarse white to pale-gray quartz-rich body with rusty reddish-brown patches and a dull to slightly glassy luster. Quartz hardness is 7 Mohs; the specimen appears massive, with no obvious cleavage and irregular fracture. Exact identification is uncertain from the photo.

Identified September 26, 2026More metamorphic →

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At a glance

Common name: Iron-stained quartz-rich rock (likely ferruginous quartzite)
Scientific name: Quartz-rich ferruginous rock, probably quartzite with iron-oxide staining (SiO₂ with hematite/goethite)
Category: metamorphic
Identified: September 26, 2026
Method: Standard

AI Estimated Value

Approximately $1–$15 as a common, unprepared hand specimen; more only if confirmed to be unusual or especially attractive.

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

Likely silica-rich rock altered or cemented/recrystallized, with iron oxides deposited during weathering. Quartzite forms through metamorphism of sandstone; age cannot be determined visually.

Uses & applications

Quartzite is used as crushed stone, road aggregate, and sometimes dimension stone; attractive pieces may be kept as specimens. This rough, iron-stained piece has little apparent gem value.

Geological facts

The rusty color commonly comes from hematite or goethite coating or filling fractures, rather than from iron throughout the quartz.

Field identification & locations

Look for hard, interlocking quartz grains and test whether it scratches glass; a streak or fresh broken surface can help distinguish iron staining from a metal-rich ore. Quartz-rich rocks are plausible in the wider Horn of Africa, but the image and coarse location do not establish a specific deposit.