metamorphic

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

Quartz-rich rock stained by iron oxides, chiefly hematite (Fe₂O₃) and/or goethite (FeO(OH)); exact identification is uncertain from the photograph

AI-generated identification · may be incorrect

White to tan, rough and massive, with rusty red-brown patches and a dull to locally slightly shiny surface. Likely quartz-rich (Mohs 7) with softer iron-oxide coatings; crystal structure and cleavage are not discernible in the image.

Identified September 26, 2026More metamorphic →

Explore Iron-stained quartz-rich rock (likely ferruginous 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 ferruginous quartzite)
Scientific name: Quartz-rich rock stained by iron oxides, chiefly hematite (Fe₂O₃) and/or goethite (FeO(OH)); exact identification is uncertain from the photograph
Category: metamorphic
Identified: September 26, 2026
Method: Standard

AI Estimated Value

About $1–$15 as a common, unverified hand specimen; higher only if distinctive or scientifically identified.

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

Quartz-rich material may have been cemented or metamorphosed, then stained by iron-bearing fluids during weathering. The photo cannot establish its exact formation history or age.

Uses & applications

If sufficiently quartz-rich and durable, similar material may be used as aggregate or decorative stone; this specimen appears more suited to casual collecting.

Geological facts

Rust-colored iron oxides commonly coat or cement otherwise pale rocks; a streak test can help distinguish hematite (typically reddish-brown) from goethite (yellow-brown).

Field identification & locations

The specimen is consistent with iron-stained quartzite, but the image alone cannot rule out an iron-rich weathered rock. Near 9.6°N, 43.0°E, regional geology makes quartz-rich and iron-stained rocks plausible; confirm with a fresh broken surface, hardness, and streak tests.