Specular Hematite with Pyrite

Physical Properties

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).

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.

Identified on: 4/22/2026

Mode: Standard