triclinic Tectosilicates
Bytownite (Tabular)
Formula (Ca,Na)(Al,Si)4O8
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}
Quick Facts
Hardness
6.0
Specific Gravity
2.72
Refractive Index
1.563
Optical Character
Biaxial +
Physical Properties
- Crystal System
- triclinic
- Hardness (Mohs)
- 6.0
- Specific Gravity
- 2.72
- Cleavage
- Perfect {001} and good {010}
- Fracture
- Uneven to conchoidal
- Lustre
- Vitreous
Optical Properties
- Refractive Index
- 1.563
- Birefringence
- 0.009
- Optical Character
- Biaxial +
Characteristics
Colours
YellowGoldenBrownish-yellowPale yellow
Localities
MexicoOregon (USA)CanadaJapan
Common Inclusions
Twin lamellaeExsolution features
Known Treatments
None commonly applied
Crystal Forms
pinacoidprism
Related Minerals
Other minerals in the triclinic system
