mineral

Botryoidal hematite (iron-oxide specimen)

Hematite, Fe₂O₃; possibly mixed with goethite/limonite

AI-generated identification · may be incorrect

Typically metallic to earthy gray-black, with a granular or botryoidal surface and red-brown streak; Mohs hardness 5–6.5, opaque, specific gravity about 5.0–5.3, lacking obvious cleavage. The pictured branching, velvety aggregate may also include goethite coatings, so exact identification requires streak or laboratory…

Identified August 14, 2026More mineral →

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Physical properties

Formation & geological history

Forms through oxidation and hydrothermal or sedimentary iron deposition, commonly as botryoidal, stalactitic, or radiating masses. Hematite deposits range from ancient Precambrian banded-iron formations to younger cavity and vein deposits.

Uses & applications

Used chiefly as an iron ore and pigment; attractive specimens are collected for their unusual shapes and luster. It is generally not used as a gemstone in this rough form.

Geological facts

Hematite’s diagnostic red streak can remain red even when the specimen appears steel-gray or black. The texture resembles “iron roses” or stalactitic hematite, though the exact morphology is difficult to confirm from one photograph.

Field identification & locations

Test an inconspicuous area on unglazed porcelain: hematite gives a red to reddish-brown streak, while goethite gives yellow-brown. Common sources include Brazil, China, Morocco, England, and the Lake Superior region.