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Annabergite
Ni3(AsO4)2 · 8H2O

     A new addition for MSH in 2006, it is the Ni end member of the Ni-Co series with erythrite, within the vivianite group. Normally similar in habit and physical properties to erythrite. Recent analysis has also confirmed more specimens of erythrite at MSH. It has been identified as green fibers on gersdorfite and nickeline.

PHYSICAL CHARACTERISTICS:

Color is green.
Luster is pearly.
Diaphaneity is transparent to translucent.
Crystal System is monoclinic; I2m.
Crystal Habits include fibers.
Cleavage: {010} is perfect.
Fracture is conchoidal.
Hardness is 2.
Specific Gravity is approximately 3.05 g/cm3.
Streak is light green.
Associated Minerals include gersdorfite and nickeline.
Distinguishing Features: Brittle. No fluorescence observed.
Origin: Named in 1852 for its locality, Annaberg, Saxony, Germany.

CLASSIFICATION:

Dana System
# 40.3.6.4

Strunz Classification
# VII/C.13-80

REFERENCES:
Dana 8:795 (1997)

DISTRIBUTION AND RARITY AT MONT SAINT-HILAIRE:

MSH
¤¤¤

PE
--

AP
--

MX
--

SS
--

MC
--

HF
--

BR
--

SX
--

FR
--

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