mineral

Erythrite (or Lab-Grown Cobaltite/Cinnabar Analog)

Erythrite (Co3(AsO4)2·8H2O)

Hardness: 1.5-2.5 (Mohs); Color: Crimson to peach-pink; Luster: Adamantine to vitreous/pearly; Crystal structure: Monoclinic; Cleavage: Perfect; Specific gravity: 3.06.

Hardness: 1
Color: Crimson to peach-pink
Luster: Adamantine to vitreous/pearly

Identified March 20, 2026More mineral →

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Physical properties

Hardness: 1.5-2.5 (Mohs); Color: Crimson to peach-pink; Luster: Adamantine to vitreous/pearly; Crystal structure: Monoclinic; Cleavage: Perfect; Specific gravity: 3.06.

Formation & geological history

Formed as a secondary mineral through the oxidation of cobalt-bearing sulfides (like cobaltite) in hydrothermal veins. Naturally occurring specimens are often found in the weathered zones of cobalt deposits.

Uses & applications

Primarily sought by mineral collectors for its vibrant color; historically used by prospectors as an indicator of silver and cobalt deposits (the 'cobalt bloom'). Lesser industrial use in cobalt pigment production.

Geological facts

Known by miners as 'cobalt bloom,' its striking magenta color once led prospectors to high-grade silver ores. This specific specimen’s intense uniform saturation suggests it may be lab-grown or treated, which is common for highly architectural pink crystal clusters on the market.

Field identification & locations

Identify by its flexible, sectile crystal blades and distinct 'blooming' magenta hue. Common natural locations include Bou Azzer, Morocco, and Cobalt, Ontario. Caution: contains arsenic; wash hands after handling.

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