mineral

Likely weathered metallic mineral or slag fragment

Uncertain; possibly limonite/goethite-coated iron mineral, or industrial iron slag

AI-generated identification · may be incorrect

Small tan-brown, irregular fragment with dull earthy-to-submetallic luster and fine linear/flow-like surface texture. Apparent hardness is roughly 4–6 Mohs, but density, streak, magnetism, and fresh fracture are needed for identification.

Identified August 23, 2026More mineral →

Explore Likely weathered metallic mineral or slag fragment in the encyclopedia →

Identify your own rocks.

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

App Store Google Play

Physical properties

Formation & geological history

If natural, iron oxides such as limonite/goethite form by weathering of iron-bearing rocks near Earth’s surface; if slag, it formed during iron smelting and is anthropogenic. The specimen’s age cannot be determined visually.

Uses & applications

Natural iron oxides are iron ores and pigments; slag has limited aggregate or industrial use and little jewelry value.

Geological facts

The rounded edges and unusual textured surface may indicate abrasion, weathering, or melted slag rather than a recognizable crystal. A strong magnet and a yellow-brown streak would support an iron-rich identification.

Field identification & locations

Check whether it attracts a magnet, leaves a yellow-brown streak on unglazed porcelain, and feels unusually dense. Common natural sources include iron-rich soils and weathered ore zones; slag is common around historic furnaces and smelters.