Mineral - Mountainite
Mountainite
Chemical Properties
Mineral Class
Silicates
Toxicity
none
Formula
KNa₂Ca₂[Si₈O₁₉(OH)] · 6H₂O
Unit Cell
a=13,51 b=6,55 c=13,51 β=104° Z=8
Physical Properties
Hardness
3
Streak
white
Density
Normal (2-3,5)
Cleavage
Undeutlich
Fracture
Tenacity
Optical Properties
Color
white
Birefringence
0,014
Luster
Silky
Transparency
translucent,
transparent
Pleochroism
Geomineralogical Properties
Crystal System
monoclinic
Point Group
Space Group
Habit
leafy, crusty, massive, acicular, rosette
Formation
Magmatisch, in alkalischen Pegmatiten, in Kimberliten
Paragenesis
Twinning
Rarity
Very rare
Synonyms
Mountainite
Composition
Elements
Mass
SiO₂
51,57
Al₂O₃
2,31
CaO
10,07
MgO
0,01
Na₂O
10,15
K₂O
4,43
H₂O
17,76
CO₂
0,87
Russland