Mineral - Nafertisite
Nafertisite
Chemical Properties
Mineral Class
Silicates
Toxicity
none
Formula
Na₃Fe²⁺₁₀Ti₂(Si₆O₁₇)₂O₂(OH)₆F(H₂O)₂
Unit Cell
a=5,35 b=16,18 c=21,95 β=95° Z=2
Physical Properties
Hardness
2 - 3
Streak
gold
Density
Normal (2-3,5)
Cleavage
Perfekt nach (010) und (001)
Fracture
fibrous
Tenacity
Brittle
Optical Properties
Color
brownbronze
Birefringence
0,066
Luster
Vitreous,
Silky
Transparency
translucent,
opaque
Pleochroism
Geomineralogical Properties
Crystal System
monoclinic
Point Group
Space Group
Habit
coarse, fibrous, massive, acicular, prismatic
Formation
Magmatisch, in alkalischen Pegmatiten
Paragenesis
Twinning
Rarity
Very rare
Synonyms
Nafertisite
Composition
Elements
Mass
Na₂O
4,8
K₂O
1,6
MgO
1,3
MnO
0,8
FeO
21,0
Fe₂O₃
14,5
Al₂O₃
1,3
TiO₂
8,3
SiO₂
38,9
H₂O
7,9
Grönland