The Mineral Erythrite

erythrite mineral picture

Erythrite is a mineral that is pink or dark red in color. The deep color is due to the presence of the chromium present in it. In the Annabergites series, Erythrite becomes the last member and Annabergite has Nickel as the dominating element while Erythrite has chromium as the dominating element. The mineral Erythrite crystallizes and forms prismatic crystals in the monoclinic system.

The color of the mineral ranges from crimson to pink, which comes out as a secondary layer called cobalt bloom over the cobalt Arsenide mineral. It is very difficult to get a fully formed crystal with the majority of the minerals clearly seen in crusts or as Reinform collectives.

mineral erythrite

erythrite mineral


The typical regions where the Erythrite Mineral occur are the Schneeberg District, Germany and Saxony. This mineral was obtained from here in dazzling, glowing and acicular (Fragile crystal minerals  with needle-like radiating bunch of slim, crystal sprays). It is in the Bou Azer district of Morocco that the biggest Erythrite crystals were obtained. Here they produce remarkable, exceptional vibrant-colored masterpieces of fantastic shapes and colors. The precise and prominent deposits of Bou Azer are the Agoudai Mine and the Aghbar mine.

Besides, Erythrite is also obtained in places like Queensland’s Mt. Cobalt, Australia; the Sara Alicia Mine, Sonora, Mexico (pink hot fibrous acicular classes); adjacent to Alamos and Timiskaming District in Ontario, Canada (pink crust, occasionally linked with silver). There are no noteworthy places in the US where Erythrite is obtained.

Derivation of Name

This mineral was portrayed initially in 1832 when it was obtained in Schneeberg, Grube Daniel, and Saxony. It earned its name from the Greek word “erythros, ” which means red.

Chemical Formulae

Co3 (AsO4) 2.8H2O

Physical characteristics

  • Color: normally hot pink, dark red with purple tint, dark red with a pink tint, hot pink and at times having a bluish hue

  • Luster: like Pearls

  • Transparency: specimens vary from sub translucent to transparent

  • Fracture: is Sectile – If scraped with a sharp knife, we get curled shavings or scrapings (e.g. Graphite)

  • Specific gravity: 3.06 – 3.18, average = 3.12

  • Hardness: 1.5-2-Talc-Gypsum


In history Erythrite is not economically considered as an essential mineral, however the prospector uses it in connection with cobalt and ordinary silver. Erythrite is an ore of cobalt, it is an essential collector’s mineral.

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