Mineral - Nenadkevichite
Nenadkevichite
Chemical Properties
Mineral Class
Silicates
Toxicity
none
Formula
(Na, □)₈Nb₄(Si₄O₁₂)₂(O,OH)₄ · 8H₂O
Unit Cell
Physical Properties
Hardness
5
Streak
white
Density
Normal (2-3,5)
Cleavage
Fracture
Tenacity
Optical Properties
Color
brownyellowpink
Birefringence
Luster
Vitreous,
Greasy
Transparency
Pleochroism
Geomineralogical Properties
Crystal System
orthorhombic
Point Group
Space Group
Habit
massive
Formation
Magmatisch, Pegmatit
Paragenesis
Twinning
Rarity
Very rare
Synonyms
Nenadkevichite