Mineral - Aramayoite
Aramayoite
Chemical Properties
Mineral Class
Sulfides and sulfosalts
Toxicity
none
Formula
Ag₃Sb₂(Bi,Sb)S₆
Unit Cell
a=7.81 b=8.27 c=8.88 α=100° β=104° γ=91° Z=2
Physical Properties
Hardness
5
Streak
black
Density
Heavy (3,5-6)
Cleavage
Perfect after {010}, indistinct after {100}, poor after {001}
Fracture
Tenacity
Inelastic-flexible
Optical Properties
Color
blackgraysilver
Birefringence
Luster
Metallic
Transparency
opaque
Pleochroism
Geomineralogical Properties
Crystal System
triclinic
Point Group
triclinic-pinacoidal - 1
Space Group
P 1 (2)
Habit
leafy, coarse, massive, tabular
Formation
In hydrothermal ore deposits
Paragenesis
Twinning
Rarity
Very rare
Synonyms
Aramayoite
Composition
Elements
Mass
Ag
34.74
Cu
0.53
Fe
0.01
Sb
29.95
Bi
13.75
As
0.10
S
20.87
Bolivia (Palache et al. 1952)
Name and first discovery : Named after the director of the "Compagnie Aramayo de Mines en Bolivia," Felix Avelino Aramayo (1846-1929). First described in 1926.
Chemistry :
Synonyms :
Varieties :
Abbreviation : Ary
literature
Palache, C., Berman, H., & Frondel, C. (1952). Dana's system of mineralogy. Geologiska Föreningen i Stockholm Förhandlingar , 74 (2), 218-219.