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Minerals - Leifite | TerraCollect
Mineral - Leifite
Leifite
(Na,H₂O)Na₆[Be₂Al₂(Al,Si)Si₁₅O₃₉]F₂
Chemical Properties
Mineral Class
Silicates
Toxicity
none
Formula
(Na,H₂O)Na₆[Be₂Al₂(Al,Si)Si₁₅O₃₉]F₂
Unit Cell
a=14.35 c=4.85 Z=3
Physical Properties
Hardness
6
Streak
white
Density
Normal (2-3,5)
Optical Properties
Color
white
gray
colorless
Birefringence
0.011
Luster
Silky
Transparency
translucent,
transparent
Pleochroism
Geomineralogical Properties
Crystal System
trigonal
Composition
Elements
Mass
SiO₂
67.55
Al₂O₃
12.69
MnO
0.41
Na₂O
15.47
F
4.93
H₂O
0.77
O=F₂
2.08
Greenland (Bøggild 1915)
Karten-Ebenen
Geologische Karte
Satelliten Karte
Cleavage
Distinct after {10
1
0}
Fracture
splintery,
uneven
Tenacity
Brittle
Point Group
ditrigonal-pyramidal - 3m
Space Group
P3m1 (156)
Habit
blocky,
fibrous,
sheaf-shaped,
spherical,
acicular,
prismatic,
barrel-shaped
Formation
Primarily magmatic to hydrothermal, in the late stage of crystallization of highly differentiated, agpaitic pegmatites and alkaline syenites under conditions of extreme sodium and beryllium alkalinity.
Paragenesis
Twinning
Rarity
Rarely
Synonyms
Leifite
Groups and Members
Leifite-Group
