Difference between revisions of "Template:Danburite"

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| Habit || Prismatic  
 
| Habit || Prismatic  
 
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| Cleavage || Indistinct
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| Cleavage || Indistinct, basal
 
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| Fracture || Sub-conchoidal
 
| Fracture || Sub-conchoidal
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| Optic nature || Biaxial +/-
 
| Optic nature || Biaxial +/-
 
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| Refractive index || 1.630-1633 to 1636-1641
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| Refractive index || 1.630-1.636
 
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|-  
 
| Birefringence || 0.006
 
| Birefringence || 0.006
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| Fluorescence || Light blue (LW)
 
| Fluorescence || Light blue (LW)
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Latest revision as of 10:19, 4 January 2007

Danburite
Chemical composition CaB2(SiO4)2

Calcium boro-silicate

Crystal system Orthorhombic
Habit Prismatic
Cleavage Indistinct, basal
Fracture Sub-conchoidal
Hardness 7.0-7.5
Optic nature Biaxial +/-
Refractive index 1.630-1.636
Birefringence 0.006
Dispersion low, 0.017
Specific gravity 3.00
Lustre Vitreous
Pleochroism Weak/not determinable
Fluorescence Light blue (LW)