Mineral - Gonyerite
Gonyerite
Chemical Properties
Mineral Class
Silicates
Toxicity
none
Formula
(Mn²⁺,Mg)₅Fe³⁺(Fe³⁺Si₃O₁₀)(OH)₈
Unit Cell
a=5,47 b=9,46 c=28,80 Z=4
Physical Properties
Hardness
2.5
Streak
brown
Density
Normal (2-3,5)
Cleavage
Perfekt auf (001)
Fracture
Tenacity
Brittle
Optical Properties
Color
brownredred brown
Birefringence
0,018
Luster
Pearly,
Waxy
Transparency
translucent,
opaque
Pleochroism
Geomineralogical Properties
Crystal System
orthorhombic
Point Group
Space Group
Habit
leafy, acicular, radial, radial
Formation
hydrothermal, in metasomatischen Skarnen
Paragenesis
Twinning
Rarity
Rarely
Synonyms
Gonyerite
Composition
Elements
Mass
SiO₂
33,06
Al₂O₃
0,58
Fe₂O₃
9,42
FeO
0,02
MnO
33,83
ZnO
0,42
PbO
0,56
MgO
11,55
CaO
0,07
H₂O
10,33
Schweden
Groups and Members
Chlorit-Gruppe