mineral

Specular Hematite with Pyrite

Iron Oxide (Fe2O3) with Iron Sulfide (FeS2)

Hardness: 5.5-6.5 (Hematite), 6-6.5 (Pyrite). Color: Steel gray to black with brassy yellow inclusions. Luster: Metallic to sub-metallic. Crystal structure: Hexagonal (Hematite), Isometric (Pyrite). Specific Gravity: ~5.0. Streak: Cherry-red (Hematite), Green-black (Pyrite).

Hardness: 5
Color: Steel gray to black with brassy yellow inclusions
Luster: Metallic to sub-metallic

Identified April 22, 2026More mineral →

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Physical properties

Formation & geological history

Formed through hydrothermal precipitation or sedimentary processes such as Banded Iron Formations (BIFs). Often found in metamorphic rocks or high-temperature hydrothermal veins where iron-rich fluids crystallize.

Uses & applications

Primary ore of iron for steel manufacturing. Specularite is used as a pigment in paints and as a gemstone (cabochons). Pyrite is used for sulfuric acid production and as a minor gold indicator.

Geological facts

Specular hematite is composed of numerous tiny micaceous flakes that sparkle like glitter. Despite its metallic gray appearance, it will always leave a reddish-brown streak on a ceramic plate.

Field identification & locations

Identify in the field by its high density (heavy for its size), metallic luster, and characteristic cherry-red streak test. Commonly found in major iron-mining districts such as the Great Lakes region (USA) or Brazil.

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