Mineral - Hellandite-(Y)
Hellandite-(Y)
Chemical Properties
Mineral Class
Silicates
Toxicity
none
Formula
(Ca,REE)₄Y₂Al □2(B₄Si₄O₂₂) (OH)₂
Unit Cell
Physical Properties
Hardness
4.5 - 6.5
Streak
Density
Cleavage
Fracture
Tenacity
Optical Properties
Color
Birefringence
Luster
Transparency
Pleochroism
Geomineralogical Properties
Crystal System
monoclinic
Point Group
Space Group
Habit
Formation
Paragenesis
Twinning
Rarity
Synonyms
Hellandite-(Y)