mineral

Likely magnetite-rich rock fragment

Magnetite (Fe₃O₄), possibly in a fine-grained host rock

AI-generated identification · may be incorrect

Small, dark gray to black, granular specimen with a metallic-to-dull luster; magnetite has Mohs hardness 5.5–6.5, an isometric crystal structure, and no cleavage. Its appearance alone cannot confirm the identification; magnetism is a useful test.

Identified October 10, 2026More mineral →

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Physical properties

Formation & geological history

Magnetite forms in igneous and metamorphic settings and in sedimentary iron deposits; the fragment’s age and precise formation environment cannot be determined from the image.

Uses & applications

Magnetite is a major iron ore and is used in steelmaking, dense-media separation, and some pigments; this small rough piece is chiefly a curiosity or teaching specimen.

Geological facts

Magnetite is naturally magnetic, and its magnetic properties gave the mineral its name. A strong attraction to a magnet would support this identification.

Field identification & locations

Check for magnetic attraction and a dark streak; these help distinguish magnetite from many similar dark minerals. Common worldwide, it occurs in igneous rocks, metamorphic deposits, and stream sediments.