mineral

Specular Hematite

Hematite (Fe2O3)

Hardness: 5.5-6.5; Color: Steel-gray to black with shimmering metallic flakes; Luster: Metallic/Specular; Crystal structure: Trigonal; Cleavage: None (uneven fracture); Specific Gravity: 5.26

Hardness: 5
Color: Steel-gray to black with shimmering metallic flakes
Luster: Metallic/Specular

Identified April 7, 2026More mineral →

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Physical properties

Hardness: 5.5-6.5; Color: Steel-gray to black with shimmering metallic flakes; Luster: Metallic/Specular; Crystal structure: Trigonal; Cleavage: None (uneven fracture); Specific Gravity: 5.26

Formation & geological history

Formed in hydrothermal veins, metamorphic rocks, and sedimentary banded iron formations. It crystallizes from oxygen-rich fluids and iron deposits often originating in the Precambrian era.

Uses & applications

Primary ore of iron. Varieties like specularite are also used in jewelry (as 'Alaska Black Diamond'), making pigments, and as decorative collector specimens.

Geological facts

Specularite gets its name from its mirror-like reflections. While the rock looks silver or black, if you rub it against a streak plate, it will leave a characteristic rust-red or reddish-brown powder.

Field identification & locations

Identify in the field by its high weight (specific gravity), brilliant sparkling luster, and most importantly, its red streak. Found globally in iron-rich districts like Lake Superior (USA) and Brazil.