mineral

Magnetite-rich iron ore

Magnetite (Fe₃O₄), possibly with hematite and silicate matrix

AI-generated identification · may be incorrect

Dark gray to black, strongly metallic to submetallic luster, granular and locally porous; Mohs hardness 5.5–6.5, cubic crystal structure, no prominent cleavage, specific gravity about 5.2. The specimen’s reflective grains and dense appearance are consistent with magnetite, though an image cannot confirm composition.

Identified August 10, 2026More mineral →

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Physical properties

Formation & geological history

Forms in igneous, metamorphic, and hydrothermal environments, including banded iron formations and volcanic deposits; many examples are Precambrian, roughly 2.5–1.8 billion years old. Weathering or oxidation can produce hematite-rich surfaces.

Uses & applications

Used as iron ore, dense aggregate, pigment, and in magnetic applications; attractive crystalline specimens are collected but are generally inexpensive.

Geological facts

Magnetite is naturally magnetic and is the most magnetic common mineral. A hand magnet should be attracted strongly, while a streak test typically gives a black streak.

Field identification & locations

Common in Australia, Brazil, Canada, Sweden, South Africa, Russia, and the United States. Test magnetism, streak, density, and hardness; avoid assuming it is meteorite material from appearance alone.