Mineral - Schneiderhöhnite
Schneiderhöhnite
Chemical Properties
Mineral Class
Oxides and Hydrxides
Toxicity
middle
Formula
Fe²⁺Fe³⁺₃As³⁺₅O₁₃
Unit Cell
a=8.92 b=10.02 c=9.10 α=60° β=112° γ=82° Z=2
Physical Properties
Hardness
3
Streak
brown
Density
Heavy (3,5-6)
Cleavage
Perfect after {100}
Fracture
smooth
Tenacity
Brittle
Optical Properties
Color
blackbrown
Birefringence
0.020
Luster
Metallic,
Adamantine
Transparency
translucent,
opaque
Pleochroism
Geomineralogical Properties
Crystal System
triclinic
Point Group
triclinic-pinacoidal - 1
Space Group
P 1 (2)
Habit
wedge-shaped, spear-shaped, spindle-shaped, tabular
Formation
Secondarily, in the oxidation zone of arsenic-bearing sulfide deposits, under hydrothermal conditions through the alteration of primary arsenides such as Löllingite.
Paragenesis
Twinning
Rarity
Rare
Synonyms
Schneiderhöhnite
Composition
Elements
Mass
As
47.03
Fe
27.90
Zn
0.93
Ge
0.37
O
23.77
Namibia (Ottemann 1974)