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Minerals - Villiaumite | TerraCollect
Mineral - Villiaumite
Villiaumite
NaF
Chemical Properties
Mineral Class
Halides
Toxicity
high
Formula
NaF
Unit Cell
a=4.63 Z=4
Physical Properties
Hardness
2 - 2.5
Streak
white
red
Density
Normal (2-3,5)
Optical Properties
Color
red
orange
Birefringence
Luster
Vitreous
Transparency
translucent,
transparent
Pleochroism
Rot-Orange
Geomineralogical Properties
Crystal System
isometric
Composition
Elements
Mass
Na
53.40
K
0.01
Mg
0.01
Ca
1.20
ZrOâ‚‚
1.50
F
44.20
Guinea (Palache et al. 1952)
Groups and Members
Halite-Group
Karten-Ebenen
Geologische Karte
Satelliten Karte
Cleavage
Perfect after {001}
Fracture
smooth
Tenacity
Brittle
Point Group
hexoctahedral - 4/m
3
2/m
Space Group
Fd
3
m (227)
Habit
granular,
massive,
Cube
Formation
Primary magmatic, forming as a late-stage crystallization product in agpaitic, highly alkaline nepheline syenites and their pegmatites under conditions of extreme fluoride enrichment and low silicic acid activity.
Paragenesis
Twinning
Rarity
Rarely
Synonyms
Villiaumite
