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Mineralpedia Details for Annabergite

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Annabergite

Annabergite

Named for the type locality in the Annaberg district of Saxony, Germany. Annabergite is an uncommon mineral that can be found in localities in, additionally, Slovakia, Austria, Spain, England, Scotland, Greece, Morocco, Iran, Bolivia, Mexico, the United States, Canada, Australia, and Japan, among several others. It is a secondary mineral that forms from the alteration of cobalt-nickel bearing arsenides and sulfides in oxidized hydrothermal deposits in association with erythrite, retgersite, gersdorffite, nickeline, maucherite, and nickelskutterudite.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/annabergite.pdf

Formula
Ni3(AsO4)2ยท8H2
Crystal System
Monoclinic 
Crystal Habit
Earthy, Encrustations, Massive 
Cleavage
Perfect, None, None 
Luster
Pearly 
Color
apple green, greenish white, gray, yellow green, white 
Streak
light green 
Class
Monoclinic - Prismatic 
Fracture
Brittle 
Hardness
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Annabergite from Aghbar mine, Bou Azzer, Anti - Atlas Mountains, Morocco

Annabergite
            from Aghbar mine, Bou Azzer, Anti - Atlas Mountains, Morocco

Very rich specimen with several groups of green, lath-like crystals of Annabergite to about 1mm.

Click thumbnail images for larger view.

Annabergite from Laurium, Attika, Greece

Annabergite
            from Laurium, Attika, Greece

Thin bladed green Annabergite crystals to 1mm.

Click thumbnail images for larger view.

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