Mineral - Zektzerite
Zektzerite
Chemical Properties
Mineral Class
Silicates
Toxicity
none
Formula
LiNaZrSi₆O₁₅
Unit Cell
a=14.33 b=17.35 c=10.16 Z=8
Physical Properties
Hardness
6
Streak
white
Density
Normal (2-3,5)
Cleavage
Perfect after {100} and {010}
Fracture
Tenacity
Brittle
Optical Properties
Color
whitepinkcolorless
Birefringence
0.002
Luster
Vitreous
Transparency
translucent,
transparent
Pleochroism
Geomineralogical Properties
Crystal System
orthorhombic
Point Group
orthorhombic-dipyramidal - 2/m 2/m 2/m
Space Group
Cmce (64)
Habit
prismatic, tabular
Formation
Late-stage magmatic-hydrothermal in peralkaline granite pegmatites, formed by the crystallization of highly differentiated Li-Zr-REE residual melts
Paragenesis
Twinning
Rarity
Rare
Synonyms
Zektzerite
Composition
Elements
Mass
SiO₂
68.24
TiO₂
0.75
ZrO₂
21.84
HfO₂
0.50
Li₂O
2.80
Na₂O
5.90
Washington (Palache et al. 1952)
Groups and Members
Tuhualit-Group