Difference between revisions of "Template:Bixbite"

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Line 17: Line 17:
 
| Optic nature || uniaxial -
 
| Optic nature || uniaxial -
 
|-
 
|-
| Refraction index || 1.58 - 1.60
+
| Refraction index || 1.561 - 1.577
 
|-  
 
|-  
| Birefringence || 0.008 - 0.009
+
| Birefringence || 0.004 - 0.009
 
|-
 
|-
 
| Dispersion || low, 0.014
 
| Dispersion || low, 0.014
 
|-  
 
|-  
| Specific gravity || 2.80 - 2.90
+
| Specific gravity || 2.63 - 2.72
 
|-
 
|-
 
| Lustre || Vitreous
 
| Lustre || Vitreous
 
|-
 
|-
| Pleochroism || shades of body color
+
| Pleochroism || weak, violet/rose
 
|}
 
|}

Revision as of 07:20, 27 October 2006

Bixbite
Chemical composition Beryllium Aluminium Silicate Be3Al2(SiO3)6
Crystal system Hexagonal
Habit prismatic
Cleavage basal, poor
Fracture conchoidal to uneven
Hardness 7.5 - 8
Optic nature uniaxial -
Refraction index 1.561 - 1.577
Birefringence 0.004 - 0.009
Dispersion low, 0.014
Specific gravity 2.63 - 2.72
Lustre Vitreous
Pleochroism weak, violet/rose