 |
||
 |
||
| G u a r a n t e e d
G e n u i n e G e m s |
||
 |
||
| Facet | ||
|
||
| Amethyst | ||
| Apatite | ||
| Aquamari | ||
| Beryl | ||
| Citrine | ||
| Danburite | ||
| Emerald | ||
| Hessonite | ||
| Malaya | ||
| Rhodolite | ||
| Spessart. | ||
| Hambergi | ||
| Iolite | ||
| Orthoclas | ||
| Phenakit | ||
| Quartz | ||
| Ruby | ||
| Sapphire | ||
| Sa. Fancy | ||
| Sa. Pink | ||
| Sa. Padpar | ||
| Sphene | ||
| Topaz | ||
| Tourmalin | ||
| Bi-color | ||
| Chrome | ||
| Green | ||
| Peach | ||
| Pink | ||
| Rubellite | ||
| Yellow | ||
|
||
| Cab. | ||
|
||
| Aquamar | ||
| Amethyst | ||
| Emerald | ||
| Hessonite | ||
| Iolite | ||
| Labrador | ||
| Quartz | ||
| Quartz bl. | ||
| Rhodolite | ||
| Ruby | ||
| Spessart. | ||
| Sap.Slice | ||
| Cab. Sapp | ||
| Tourmalin | ||
| Cat's eye | ||
| Green | ||
| Pink | ||
| Peach | ||
| Polychro. | ||
| Rubellite | ||
| Slice | ||
|
G e n u i n e G e m s |
||
 |
||
 |
||
 |
 |
| 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 TRACK ORDERS |
|
| DANBURITE NATURAL COLOR Hardness 7.5 |
|
| ¦ Danburite 2 ¦ Danburite crystal ¦ |  |
|
19.11 cts. Danburite emerald cut single
28.1 x 10.1 mm. Eye clean. Enhancement: none (N) |
stone PRICE
USD 4490.00 ORIGIN: Madagascar ref: Dye 1911 |
 |
8.38 cts. Yellow Danburite oval single
13.4 x 11.2 x 8.1 mm. Eye clean. Enhancement: none (N) |
stone PRICE
USD 1250.00 ORIGIN: Madagascar ref: Dyo 838 |
 |
6.29 cts. Yellow-orange Danburite oval single
16 x 8.7 mm. Eye clean. Enhancement: none (N) |
stone PRICE
USD 929.00 ORIGIN: Madagascar ref: Dyo 629 |
 |
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 |
 |
6.77 cts. Yellow-orange Danburite pear single
15.4 x 10 mm. Eye clean. Enhancement: none (N) |
stone PRICE
USD 990.00 ORIGIN: Madagascar ref: Dyd 677 |
 |
6.07 cts. Danburite oval single
13.8 x 9.3 mm. Eye clean. Enhancement: none (N) |
stone PRICE
USD 745.00 ORIGIN: Madagascar ref: Dyo 607 |
 |
3.63 cts. Yellow-orange Danburite oval single
11.4 x 8.3 mm. Eye clean. Enhancement: none (N) |
stone PRICE
USD 354.00 ORIGIN: Madagascar ref: Dyo 363 |
 |
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 346.00 ORIGIN: Madagascar ref: Dyo329 |
 |
4.29 cts. Danburite oval single
17.9 x 7.6 x 4.8 mm. Loupe clean. Enhancement: none (N) |
stone PRICE
USD 421.00 ORIGIN: Madagascar ref: Dyo429 |
 |
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 198.00 ORIGIN: Madagascar ref: Dyo222 |
 |
1.66cts. Danburite emerald cut single
12.9 x 4.7 mm. Slightly included. Enhancement: none (N) |
stone PRICE
USD 154.00 ORIGIN: Madagascar ref: Dye166 |
 |
¦ Danburite 2 ¦ Danburite crystal ¦ | |
| To purchase a stone from this site click to ORDER | ||
General Information |
||||
| 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 |
||||
| Images: |
|
|
||
| © Image by A. Darbellay | ||||
Crystallography |
||||
| 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 |
||||
| 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 |
||||
| 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 |
||||
| 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}] | ||||
|
||||
|
||||
Click on the picture to go to Danburite crystal.  |
¦ Danburite 2 ¦ Danburite crystal ¦ | |
