Mineral - Janhaugite
Janhaugite
Chemical Properties
Mineral Class
Silicates
Toxicity
none
Formula
(Na,Ca)₃(Mn²⁺,Fe²⁺)₃(Ti,Zr,Nb)₂(Si₂O₇)₂O₂(OH,F)₂
Unit Cell
a=10,67 b=9,79 c=13,93 β=108° Z=4
Physical Properties
Hardness
5
Streak
brown
Density
Normal (2-3,5)
Cleavage
Deutlich auf {010}
Fracture
nd
Tenacity
Brittle
Optical Properties
Color
brownredorange
Birefringence
0,140
Luster
Vitreous
Transparency
translucent,
opaque
Pleochroism
Geomineralogical Properties
Crystal System
monoclinic
Point Group
Space Group
Habit
massive
Formation
Magmatisch, In Miarolen von natriumreichen Granitpegmatiten
Paragenesis
Twinning
Selten nach {100}
Rarity
Rare
Synonyms
Janhaugite
Composition
Elements
Mass
SiO₂
29,8
TiO₂
15,2
ZrO₂
6,0
Nb₂O₅
5,0
Ta₂O₅
0,3
FeO
5,5
MnO
22,3
CaO
1,5
Na₂O
11,0
K₂O
0,2
F
2,7
H₂O
1,6
Norwegen
Groups and Members
Wöhlerit-Gruppe