sedimentary

Weathered iron-rich sandstone or ferruginous conglomeratic rock

Ferruginous sandstone, likely hematite/goethite-bearing quartz sandstone

AI-generated identification · may be incorrect

Brown-red, orange, gray, and black mottling with a dull to slightly earthy luster; likely quartz-rich with iron oxides and possible clay minerals. Hardness approximately 5–7, no obvious cleavage, granular texture, and moderate-to-high density.

Identified August 28, 2026More sedimentary →

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At a glance

Common name: Weathered iron-rich sandstone or ferruginous conglomeratic rock
Scientific name: Ferruginous sandstone, likely hematite/goethite-bearing quartz sandstone
Category: sedimentary
Identified: August 28, 2026
Method: Standard

AI Estimated Value

Approximately $2–$15 as a common natural specimen; potentially $20–$50 if unusually attractive, locality-labeled, or strongly magnetic.

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 sediment was cemented and stained by iron oxides such as hematite and goethite, possibly with localized pebble or breccia-like zones. Its exact geological age cannot be determined from the photograph; such rocks occur from Precambrian to recent formations.

Uses & applications

Usually used as a decorative or educational specimen; iron-rich sandstone may be crushed for aggregate or pigment, but this piece is unlikely to have significant industrial or gem value.

Geological facts

The red coloration generally reflects oxidized iron, while darker gray-black areas may contain magnetite, manganese oxides, or unoxidized minerals. A streak test and dilute acid test would help distinguish it from volcanic rock or ironstone.

Field identification & locations

Common in arid and sedimentary regions worldwide, including formations in North America, Europe, Australia, and India. Check for visible sand grains, weak-to-moderate magnetism, and a reddish-brown streak; avoid assuming a precise identification from appearance alone.