Difference between revisions of "Template:Topaz"

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| Chemical composition || Al<sub>2</sub>(F,OH)<sub>2</sub>SiO<sub>4</sub>
 
| Chemical composition || Al<sub>2</sub>(F,OH)<sub>2</sub>SiO<sub>4</sub>
 
|-
 
|-
| Crystal system || orthorhombic
+
| Crystal system || Orthorhombic
 
|-
 
|-
| Habit || prismatic with pyramidal/domed terminations
+
| Habit || Prismatic with pyramidal/domed terminations
 
|-
 
|-
| Cleavage || perfect, basal
+
| Cleavage || Perfect, basal
 
|-
 
|-
| Fracture || sub-conchoidal to uneven
+
| Fracture || Sub-conchoidal to uneven
 
|-
 
|-
 
| Hardness || 8
 
| Hardness || 8
 
|-
 
|-
| Optic nature || bixaial +
+
| Optic nature || Biaxial +
 
|-
 
|-
 
| Refractive index || 1.606-1.644
 
| Refractive index || 1.606-1.644
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| Birefringence || 0.008 - 0.010
 
| Birefringence || 0.008 - 0.010
 
|-
 
|-
| Dispersion || low, 0.014
+
| Dispersion || Low, 0.014
 
|-  
 
|-  
 
| Specific gravity || 3.49 - 3.57
 
| Specific gravity || 3.49 - 3.57
 
|-
 
|-
| Lustre || vitreous
+
| Lustre || Vitreous
 
|-
 
|-
| Pleochroism || distinct to strong depending on body color
+
| Pleochroism || Distinct to strong (depending on body color)
 
|}
 
|}

Revision as of 21:08, 23 December 2006

Topaz
Chemical composition Al2(F,OH)2SiO4
Crystal system Orthorhombic
Habit Prismatic with pyramidal/domed terminations
Cleavage Perfect, basal
Fracture Sub-conchoidal to uneven
Hardness 8
Optic nature Biaxial +
Refractive index 1.606-1.644
Birefringence 0.008 - 0.010
Dispersion Low, 0.014
Specific gravity 3.49 - 3.57
Lustre Vitreous
Pleochroism Distinct to strong (depending on body color)