Mineral - Aerugite
Aerugite
Chemical Properties
Mineral Class
Arsenates
Toxicity
middle
Formula
Ni₁₇As₆O₃₂
Unit Cell
a=5.95 c=27.57 Z=1
Physical Properties
Hardness
4
Streak
green
Density
Cleavage
nd
Fracture
nd
Tenacity
Optical Properties
Color
browngreen
Birefringence
Luster
Vitreous,
Resinous
Transparency
translucent,
transparent
Pleochroism
Geomineralogical Properties
Crystal System
trigonal
Point Group
ditrigonal-scalenohedral - 3 m
Space Group
R 3 m (166)
Habit
coarse, crusty
Formation
In the oxidation zone of hydrothermal Cu-Ni-As deposits through the transformation of primary sulphides such as Tennantite and Enargite in the presence of chlorine-containing solutions
Paragenesis
Twinning
Rarity
Very rare
Synonyms
Aerugite
Composition
Elements
Mass
P₂O₅
0.14
A₂O₅
36.57
Bi₂O₃
0.24
Fe₂O₃
>0.01
CoO
0.54
NiO
62.07
CuOs
0.34
Germany (Dana 1892)
Name and first discovery : Named after the Latin word "aerugo" for "copper rust," due to its intense green color, often typical of secondary copper minerals. The mineral was first described in 1858 by Carl Wilhelm Bergemann. He discovered it in a sample from the area around Johanngeorgenstadt in the Ore Mountains, which he had received from the mineralogist Adam August Krantz. Krantz, in turn, had found the sample in a collection purchased in Schneeberg in 1857.
Chemistry :
Synonyms :
Varieties :
Abbreviation : Aru
literature
Dana, J. D., & Dana, E. S. (1892). The system of mineralogy of James Dwight Dana, 1837-1868: descriptive mineralogy . J. Wiley & sons.