Annabergite

Annabergite is a nickel arsenate mineral, isomorphous with vivianite and erthyrite.

It is typically only found with minute crystals around areas rich in ores of nickel.

Annabergite should be considered toxic and handling should be minimised.

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Information about Annabergite

 

Appearance

 

A rare bright green nickel arsenate mineral, the end member of a series with Erythite, where Erythrite is the cobalt-heavy end member and Annabergite is the nickel-heavy end member.


Uses and History

 

No industrial uses as far as I’m aware, but perhaps used in the identification of sites with other nickel minerals. Was known by miners as ‘nickel bloom’.

 

Named after its type locality of Annaberg, Saxony, Germany.

 


Mineralogy

Chemistry
A hydrous nickel arsenate with the formula Ni3(AsO4)2 · 8H2O
Colours and Variations
Green, apple green, grey, white, rose red, pink pink-red
Streak
Pale green to white
Luster
Subadamantine, subvitreous, pearly, earthy
Transparency
Transparent to translucent
Fracture
Splintery
Crystal habit
Forms crusts, or botryoidal groups in vugs. May also form acicular or fibrous groups, as an earthy crust, or in massive form. Crystals are small, thin, bladed, usually with striations and angled termination.
Mohs hardness
1.5 – 2.5
Fluorescence
Specific Gravity
3.07
Easiest testing method

Hazards and Warnings

 

Toxic mineral: contains arsenic and nickel, and often cobalt. Handle with care.

 

 

Mineral collectors should wash their hands after handling specimens, to avoid any exposure to potential toxins.
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:

Hindi:

Portuguese:

  • Annabergita

Bengali:

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English:

Italian:

Russian:

  • Аннабергит

French:

Japanese:

  • アンナベルガイト

Spanish:

  • Annabergita

German:

  • Annabergit

Korean:

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Gujurati:

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Further Reading / External Links

  • https://www.mindat.org/min-240.html
  • https://www.minerals.net/mineral/annabergite.aspx
  • https://en.wikipedia.org/wiki/Annabergite