Mineral - Kostylevite
Kostylevite
Chemical Properties
Mineral Class
Silicates
Toxicity
none
Formula
K₂Zr(Si₃O₉) · H₂O
Unit Cell
a=13,17 b=11,72 c=6,57 β=105° Z=2
Physical Properties
Hardness
5
Streak
white
Density
Normal (2-3,5)
Cleavage
perfekt nach {100}
Fracture
nd
Tenacity
Brittle
Optical Properties
Color
whitecolorless
Birefringence
0,015
Luster
Vitreous
Transparency
translucent,
transparent
Pleochroism
Geomineralogical Properties
Crystal System
monoclinic
Point Group
Space Group
Habit
prismatic, tabular
Formation
In Alkalipegmatiten
Paragenesis
Twinning
Nach (100)
Rarity
Rare
Synonyms
Kostylevite
Composition
Elements
Mass
SiO₂
42,0
TiO₂
2,1
ZrO₂
24,0
HfO₂
0,6
Fe₂O₃
0,02
CaO
0,01
Na₂O
0,01
K₂O
22,1
H₂O
4,3
Russland