Mineral - Chevkinite-(Ce)
Chevkinite-(Ce)
Chemical Properties
Mineral Class
Silicates
Toxicity
radioactive
Formula
(Ce,La,Ca,Th)₄(Fe²⁺,Mg)(Fe²⁺,Ti,Fe³⁺)₂(Ti,Fe³⁺)₂(Si₂O₇)₂O₈
Unit Cell
Physical Properties
Hardness
5 - 5.5
Streak
brown
Density
Heavy (3,5-6)
Cleavage
Fracture
conchoidal
Tenacity
Brittle
Optical Properties
Color
black
Birefringence
0.083
Luster
Metallic
Transparency
opaque
Pleochroism
Geomineralogical Properties
Crystal System
monoclinic
Point Group
monoclinic-prismatic - 2/m
Space Group
C2/m (12)
Habit
tabular
Formation
In igneous rocks and their pegmatites
Paragenesis
Twinning
Rarity
Rarely
Synonyms
Chevkinite-(Ce), Chevkinite
Groups and Members
Chevkinite-Group
Chevkinite-Subgroup