Mineral - Vittinkiite
Vittinkiite
Chemical Properties
Mineral Class
Silicates
Toxicity
none
Formula
MnMn₃Mn[Si₅O₁₅]
Unit Cell
a=9,22 b=8,52 c=7,98 α=55° β=62° γ=69° Z=2
Physical Properties
Hardness
5.5 - 6.5
Streak
white
Density
Normal (2-3,5)
Cleavage
Perfekt auf (201) und gut auf (021) und (210)
Fracture
conchoidal,
uneven
Tenacity
Brittle
Optical Properties
Color
redpink
Birefringence
0,020
Luster
Vitreous
Transparency
translucent,
transparent,
opaque
Pleochroism
Geomineralogical Properties
Crystal System
triclinic
Point Group
Space Group
Habit
coarse, granular, massive, Rhombohedron, tabular
Formation
Metamorphose von Mangan-reichen Sedimenten
Paragenesis
Twinning
Rarity
Rare
Synonyms
Vittinkiite
Composition
Elements
Mass
MgO
0,52
CaO
0,93
MnO
51,82
FeO
1,26
ZnO
0,11
SiO₂
46,48
Finnland
Groups and Members
Rhodonit-Gruppe