Difference between revisions of "Template:Danburite"
From The Gemology Project
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| Habit || Prismatic | | Habit || Prismatic | ||
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− | | Cleavage || Indistinct | + | | Cleavage || Indistinct, basal |
|- | |- | ||
| Fracture || Sub-conchoidal | | Fracture || Sub-conchoidal | ||
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| Optic nature || Biaxial +/- | | Optic nature || Biaxial +/- | ||
|- | |- | ||
− | | Refractive index || 1.630- | + | | Refractive index || 1.630-1.636 |
|- | |- | ||
| 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 | |
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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) |