Mineral - Fluorellestadite
Fluorellestadite
Chemical Properties
Mineral Class
Silicates
Toxicity
none
Formula
Ca₅(SiO₄)₁,5(SO₄)₁,5F
Unit Cell
a=9,49 c=6,92 Z=4
Physical Properties
Hardness
4.5
Streak
whiteblueblue white
Density
Normal (2-3,5)
Cleavage
Unvollkommen auf (0001)
Fracture
conchoidal
Tenacity
Brittle
Optical Properties
Color
yellow
Birefringence
0,005
Luster
Vitreous,
Greasy
Transparency
translucent,
transparent
Pleochroism
Geomineralogical Properties
Crystal System
hexagonal
Point Group
Space Group
Habit
coarse, granular, massive, acicular, prismatic, columnar, prismatic
Formation
Metasomatose, Kontaktmetamorphoe mit Kalksteinen
Paragenesis
Twinning
Rarity
Rarely
Synonyms
Fluorellestadite
Composition
Elements
Mass
SiO₂
15,30
Al₂O₃
1,84
Fe₂O₃
0,11
MnO
0,18
MgO
1,38
CaO
55,00
Na₂O
0,33
K₂O
0,10
F
3,60
H₂O
0,30
CO₂
0,66
P₂O₅
1,31
SO₃
20,75
Russland
Groups and Members
Apatit-Supergruppe
Ellestadit-Gruppe