mineral

Polished hematite (possibly specular hematite)

Hematite, α‑Fe₂O₃

AI-generated identification · may be incorrect

Dark steel-gray to nearly black, with a metallic-to-submetallic sheen and smooth, rounded polish. Mohs hardness 5–6; trigonal crystal structure; specific gravity about 5.0–5.3. The photo does not show diagnostic crystal faces, so identification is provisional.

Identified October 3, 2026More mineral →

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Physical properties

Formation & geological history

Hematite forms through oxidation and precipitation of iron, in sedimentary iron formations, soils, and hydrothermal or metamorphic settings. It occurs in rocks of many ages; the specimen’s age cannot be determined from the image.

Uses & applications

Used chiefly as iron ore and pigment; polished pieces are also sold as inexpensive jewelry stones and collectibles.

Geological facts

Despite its dark appearance, hematite typically leaves a reddish-brown streak—one of its most useful diagnostic tests.

Field identification & locations

The rounded shape and shine suggest a polished or tumbled specimen. Test an inconspicuous spot on unglazed porcelain for a red-brown streak; the reported southeastern Texas location is sedimentary, so transported or purchased material is possible, but the image alone cannot confirm hematite.