Mineral - Homilite
Homilite
Chemical Properties
Mineral Class
Silicates
Toxicity
none
Formula
Ca₂(Fe²⁺,Mg)B₂Si₂O₁₀
Unit Cell
a=9,79 b=7,62 c=4,78 β=91° Z=2
Physical Properties
Hardness
5 - 5.5
Streak
gray
Density
Normal (2-3,5)
Cleavage
Undeutlich
Fracture
conchoidal
Tenacity
Brittle
Optical Properties
Color
blackgreenbluegreen blackblue green
Birefringence
0,023
Luster
Vitreous,
Resinous
Transparency
translucent
Pleochroism
Geomineralogical Properties
Crystal System
monoclinic
Point Group
Space Group
Habit
massive, Octahedron, tabular
Formation
Magmatisch, in Pegmatiten
Paragenesis
Twinning
Auf (001) und (100)
Rarity
Very rare
Synonyms
Homilite
Composition
Elements
Mass
B₂O₃
31,87
Al₂O₃
18,08
Fe₂O₃
1,50
FeO
2,15
MnO
16,25
MgO
0,01
CaO
0,52
Na₂O
27,28
1,50
SiO2
Groups and Members
Gadolinit-Supergruppe
Gadolinit-Gruppe
Datolith-Subgruppe