Mineral - Londonite
Londonite
Chemical Properties
Mineral Class
Borates
Toxicity
none
Formula
(Cs,K,Rb)Al₄Be₄(B,Be)₁₂O₂₈
Unit Cell
Physical Properties
Hardness
8
Streak
white
Density
Normal (2-3,5)
Cleavage
Fracture
Tenacity
Optical Properties
Color
yellowcolorless
Birefringence
Luster
Vitreous
Transparency
Pleochroism
Geomineralogical Properties
Crystal System
isometric
Point Group
Space Group
Habit
dodecahedron, Tetrahedron
Formation
Magmatisch
Paragenesis
Twinning
Rarity
Rarely
Synonyms
Londonite