Mineral - Fluorluanshiweiite
Fluorluanshiweiite
Chemical Properties
Mineral Class
Silicates
Toxicity
none
Formula
KLiAl₁,5(Si₃,5Al₀,5)O₁₀F₂
Unit Cell
a=5.20 b=8.99 c=10.13 β=101° Z=2
Physical Properties
Hardness
3
Streak
white
Density
Normal (2-3,5)
Cleavage
Perfect after {001}
Fracture
smooth
Tenacity
Elastic-flexible
Optical Properties
Color
graypinkviolet
Birefringence
0.029
Luster
Silky,
Pearly
Transparency
translucent,
transparent
Pleochroism
Geomineralogical Properties
Crystal System
monoclinic
Point Group
monoclinic-prismatic - 2/m
Space Group
C2/m (12)
Habit
leafy, tabular
Formation
Magmatic in Li-pegmatites
Paragenesis
Twinning
Rarity
Rare
Synonyms
Fluorluanshiweiite
Composition
Elements
Mass
K₂O
9.87
Rb₂O
2.86
Cs₂O
0.86
Na₂O
0.26
FeO
0.26
MnO
0.43
Al₂O₃
23.65
SiO₂
52.42
F
9.35
Li₂O
3.85
China (Qu et al. 2020)
Groups and Members
Mica-Supergroup
Lepidolite-Group