Erythrite

Erythrite is a cobalt arsenate mineral, which is often really rather pretty – a dark pink to red colour with prismatic crystals that grow in fascinating patterns.

Historically, erythrite was known as ‘cobalt bloom’ by miners, because its noticable presence helped to identify locations where cobalt bearing minerals would be found.

Showing all 2 results

Appearance

A fantastic looking dark pink-red mineral, which occurs in a range of crystal habits – the best specimens are striated prismatic crystals, or radial growths. Well formed crystals are rare and prized by collectors.


Uses and History

It is often known as ‘cobalt bloom’, or ‘red cobalt’ – cobalt bloom is a term given to it by miners, who knew that the presence of Erythrite meant the presence of other cobalt bearing minerals in the area.

 

Locales

Africa:

  • Aghbar, Irhtem, and other mines in the Bou Azzer district, Morocco

Asia:

Europe:

  • Occurs in a range of English mines, especially in Cornwall.

South America:

Antarctica:

Australia and Oceania:

  • Mount Cobalt Mine, Queensland, Australia

North America:


Mineralogy

Chemistry
Cobalt arsenate with the chemical formula Co3(AsO4)2·8H2O
Colours and Variations
Pink to crimson red, sometimes pale rose pink.
Streak
Pale red to pink
Luster
Subadamantine
Transparency
Transparent to translucent
Fracture
Conchoidal to irregular
Crystal habit
Radial aggregates, fibrous, massive, powdery – rarely striated prismatic crystals.
Mohs hardness
1.5-2.5
Fluorescence
Specific Gravity
3.06
Easiest testing method

Hazards and Warnings

Toxic, cobalt arsenate mineral. Wash hands after handling.

Almost all rocks, minerals (and, frankly, almost all other substances on earth) can produce toxic dust when cutting, which can cause serious respiratory conditions including silicosis. When cutting or polishing rocks, minerals, shells, etc, all work should be done wet to minimise the dust, and a suitable respirator or extraction system should be used.


Translations

Arabic:

  • إريثريت

Hindi:

  • एरिथ्राइट

Portuguese:

Bengali:

Indonesian:

Punjabi:

English:

  • erythrite, cobalt bloom

Italian:

  • eritrite

Russian:

French:

  • érythrite

Japanese:

  • エリトリット

Spanish:

German:

Korean:

Thai:

Gujurati:

Mandarin Chinese:

Urdu:


Further Reading / External Links