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u a r a n t e e d
G e n u i n e G e m s |
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| Facet | ||
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| Amethyst | ||
| Apatite | ||
| Aquamari | ||
| Beryl | ||
| Citrine | ||
| Danburite | ||
| Emerald | ||
| Hessonite | ||
| Malaya | ||
| Rhodolite | ||
| Spessart. | ||
| Hambergi | ||
| Iolite | ||
| Orthoclas | ||
| Phenakit | ||
| Quartz | ||
| Ruby | ||
| Sapphire | ||
| Sa. Fancy | ||
| Sa. Pink | ||
| Sa.Sunset | ||
| Sphene | ||
| Topaz | ||
| Tourmalin | ||
| Bi-color | ||
| Chrome | ||
| Green | ||
| Peach | ||
| Pink | ||
| Rubellite | ||
| Yellow | ||
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| Cab. | ||
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| Aquamar | ||
| Amethyst | ||
| Emerald | ||
| Hessonite | ||
| Iolite | ||
| Labrador | ||
| Quartz | ||
| Quartz bl. | ||
| Rhodolite | ||
| Ruby | ||
| Spessart. | ||
| Sap.Slice | ||
| Sapp.Star | ||
| Tourmalin | ||
| Cat's eye | ||
| Green | ||
| Pink | ||
| Peach | ||
| Polychro. | ||
| Rubellite | ||
| Slice | ||
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G e n u i n e G e m s |
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| Services SINGLE STONES PAIRS SETS CABOCHONS COLLECTOR'S DESIGNER'S |
| Site map WELCOME ORDER TERMS MINERALS RESERVE CONTACT US ABOUT US |
| Usually ships within 24 hours SEARCH FORM HELP INFO. FR INFO. DE TRACK ORDERS |
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| DANBURITE NATURAL COLOR Hardness 7.5 |
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| ¦ Danburite 2 ¦ Danburite crystal ¦ |  |
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19.11
cts.
Danburite emerald cut single
28.1 x 10.1 mm. Eye clean. Enhancement: none (N) |
stone PRICE
USD 2790.00 ORIGIN: Madagascar
ref: Dye 1911
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8.38
cts. Yellow Danburite oval single
13.4 x 11.2 x 8.1 mm. Eye clean. Enhancement: none (N) |
stone PRICE
USD 838.00 ORIGIN: Madagascar
ref: Dyo 838
|
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6.29
cts. Yellow-orange Danburite oval single
16 x 8.7 mm. Eye clean. Enhancement: none (N) |
stone PRICE
USD 629.00 ORIGIN: Madagascar
ref: Dyo 629
|
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8.33
cts.
Danburite oval single
16.2 x 10.4 mm. Slightly included. Enhancement: none (N) |
stone PRICE
USD 599.00 ORIGIN: Madagascar
ref: Dyo 833
|
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6.77
cts. Yellow-orange Danburite pear single
15.4 x 10 mm. Eye clean. Enhancement: none (N) |
stone PRICE
USD 812.00 ORIGIN: Madagascar
ref: Dyd 677
|
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6.07
cts.
Danburite oval single
13.8 x 9.3 mm. Eye clean. Enhancement: none (N) |
stone PRICE
USD 425.00 ORIGIN: Madagascar
ref: Dyo 607
|
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3.63
cts. Yellow-orange Danburite oval single
11.4 x 8.3 mm. Eye clean. Enhancement: none (N) |
stone PRICE
USD 254.00 ORIGIN: Madagascar
ref: Dyo 363
|
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3.29
cts. Yellow-orange Danburite oval single
11.8 x 7.7 x 5.8 mm. Loupe clean. Enhancement: none (N) |
stone PRICE
USD 246.00 ORIGIN: Madagascar
ref: Dyo329
|
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4.29
cts.
Danburite oval single
17.9 x 7.6 x 4.8 mm. Loupe clean. Enhancement: none (N) |
stone PRICE
USD 321.00 ORIGIN: Madagascar
ref: Dyo429
|
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2.22
cts. Yellow-orange Danburite oval single
10.3 x 7.1 mm. (s.u.g.f. cut) Eye clean. Enhancement: none (N) |
stone PRICE
USD 178.00 ORIGIN: Madagascar
ref: Dyo222
|
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1.66cts.
Danburite emerald cut single
12.9 x 4.7 mm. Slightly included. Enhancement: none (N) |
stone PRICE
USD 114.00 ORIGIN: Madagascar
ref: Dye166
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¦ Danburite 2 ¦ Danburite crystal ¦ | |
| To purchase a stone from this site click to ORDER | ||
General Information |
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| Chemical Formula: | CaB2(SiO4)2 | |||
| Composition: | Molecular Weight = 245.86 gm | |||
| Calcium 16.30 % Ca 22.81 % CaO | ||||
| Silicon 22.85 % Si 48.88 % SiO2 | ||||
| Boron 8.79 % B 28.32 % B2O3 | ||||
| Oxygen 52.06 % O | ||||
| ______ ______ | ||||
| 100.00 % 100.00 % = TOTAL OxIDE | ||||
| Empirical Formula: | CaB2Si2O8 | |||
| Environment: | Contact metamorphic rocks. | |||
| Locality: | Madagascar | |||
| Name Origin: | Named after its location. Danbury, Connecticut. | |||
Danburite Image |
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| Images: |
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| © Image by A. Darbellay | ||||
Crystallography |
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| Axial Ratios: | a:b:c =0.9184:1:0.8822 | |||
| Cell Dimensions: | a = 8.048, b = 8.763, c = 7.731, Z = 4; V = 545.23 Den(Calc)= 3.00 | |||
| Crystal System: | Orthorombic-Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pnam | |||
| x Ray Diffraction: | By Intensity(I/Io): 3.564(1)2.654(0.75) 2.961(0.7) | |||
Physical Properties |
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| Cleavage: | [001] Poor | |||
| Color: | colorless, white, gray, brownish white, or straw yellow. | |||
| Density: | 2.97 - 3.02, Average = 2.99 | |||
| Diaphaniety: | Transparent to translucent | |||
| Fracture: | Sub Conchoidal - Fractures developed in brittle materials characterized by semi-curving surfaces. | |||
| Habits: | Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline)., Disseminated - Occurs in small, distinct particles dispersed in matrix., Euhedral Crystals - Occurs as well-formed crystals showing good external form. | |||
| Hardness: | 7 - Quartz | |||
| Luminescence: | Fluorescent. | |||
| Luster: | Vitreous - Greasy | |||
| Streak: | white | |||
Optical Properties |
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| Optical Data: | Biaxial (+/-), a=1.63, b=1.633, g=1.636, bire=0.0060, 2V(Calc)=88, 2V(Meas)=88-90. Dispersion relatively strong. | |||
Classification |
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| Dana Class: | Sorosilicate Si2O7 Groups and O, OH, F. and H2O | |||
| with [Si2O7] with borate groups | ||||
| Dana Group | ||||
| Strunz Class: | Silicates | |||
| Tectosilicates (network) without anions unfamiliar to the tetraheders | ||||
| STRUNZ - Silicates [Tectosilicates (network) without anions unfamiliar to the tetraheders {Reedmergnerite - Danburite series}] | ||||
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Click on the picture to go to
Danburite crystal.
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¦ Danburite 2 ¦ Danburite crystal ¦ | |
