mineral

Likely magnetite-rich iron ore

Magnetite (Fe₃O₄), possibly in a dense massive ironstone matrix

AI-generated identification · may be incorrect

Black to steel-gray, strongly metallic to submetallic luster, uneven fracture, and no obvious cleavage; Mohs hardness about 5.5–6.5, specific gravity approximately 5.2. The surface appears naturally granular and reflective, though lighting limits certainty.

Identified September 4, 2026More mineral →

Explore Likely magnetite-rich iron ore 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

Magnetite forms in igneous, metamorphic, and hydrothermal environments, including banded iron formations and mafic or ultramafic rocks; many deposits are Precambrian (over 540 million years old).

Uses & applications

Used as an iron ore, dense aggregate, pigment, and source of magnetic media; attractive pieces are collected but are generally not jewelry-grade.

Geological facts

A hand magnet should attract it strongly, often more strongly than hematite. The specimen may be a massive magnetite ore rather than a single crystal.

Field identification & locations

Common worldwide, notably in Australia, Brazil, Sweden, South Africa, India, and the Lake Superior region of North America. Confirm with a strong magnet, streak test (black streak), and unusually high heft; avoid confusing it with slag or polished industrial iron.