triclinic Tectosilicates
Bytownite (Tabular)
(Ca,Na)(Al,Si)4O8
Quick Facts
Hardness
6.0
Specific Gravity
2.72
Refractive Index
1.563
Optical Character
Biaxial +
Crystal Structure
#! Species: Bytownite
#! System: Triclinic (-1)
#! Habit: Tabular on {010}
triclinic[-1]:{010}@1.0 + {001}@0.8 + {110}@0.6
triclinic
-1
{010} {010} {001} {110}
Physical Properties
Crystal Systemtriclinic
Hardness (Mohs)6.0
Specific Gravity2.72
CleavagePerfect {001} and good {010}
FractureUneven to conchoidal
LustreVitreous
Optical Properties
Refractive Index1.563
Birefringence0.009
Optical CharacterBiaxial +
Colours
YellowGoldenBrownish-yellowPale yellow
Localities
MexicoOregon (USA)CanadaJapan
Common Inclusions
Twin lamellaeExsolution features
Known Treatments
None commonly applied
Crystal Forms
pinacoidprism
Interactive Preview
Open this crystal in the CDL Playground to rotate, export, and explore in 3D.
Open in Playground #! Species: Bytownite
#! System: Triclinic (-1)
#! Habit: Tabular on {010}
triclinic[-1]:{010}@1.0 + {001}@0.8 + {110}@0.6
Related Minerals
Other minerals in the triclinic system
