Mineral - Niobophyllite
Niobophyllite
Chemical Properties
Mineral Class
Silicates
Toxicity
none
Formula
(K,Na)₃(Fe,Mn)₆(Nb,Ti)₂Si₈(O,OH,F)₃₁
Unit Cell
Physical Properties
Hardness
3 - 4
Streak
brownyellowyellow brown
Density
Normal (2-3,5)
Cleavage
Fracture
Tenacity
Optical Properties
Color
brownorangeyellow
Birefringence
Luster
Vitreous,
Greasy,
Earthy
Transparency
Pleochroism
Geomineralogical Properties
Crystal System
triclinic
Point Group
Space Group
Habit
prismatic, tabular
Formation
Magmatisch
Paragenesis
Twinning
Rarity
Very rare
Synonyms
Niobophyllite