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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. Padpar | ||
| 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 | ||
| Cab. Sapp | ||
| 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 TRACK ORDERS |
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| DANBURITE NATURAL COLOR Hardness 7.5 |
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19.72 cts. Danburite single crystal
18.5 x 10.9 mm. Enhancement: none (N) The DANBURITE crystals is externally undamaged. |
stone PRICE
SOLD ORIGIN: Madagascar ref: Dyr1972 |
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28.01 cts. Danburite single crystal
24 x 14 mm. Enhancement: none (N) The DANBURITE crystals is externally undamaged. |
stone PRICE
USD 150.00 ORIGIN: Madagascar ref: Dyr2801 |
 Enlarge |
76.94 cts. Danburite crystal single
40.3 x 20.4 x 13.9 mm. Enhancement: none (N) The DANBURITE crystal is externally almost undamaged. |
stone PRICE
USD 440.00 ORIGIN: Madagascar ref: Dyr7694 |
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16 grms. Danburite single crystal
37 x 16.1 mm. Enhancement: none (N) The DANBURITE crystals is externally undamaged. |
stone PRICE
SOLD ORIGIN: Madagascar ref: Dyr1600g |
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14.09 cts. Danburite single crystal
25.5 x 8.6 mm. Enhancement: none (N) The DANBURITE crystals is externally undamaged. |
stone PRICE
USD 120.00 ORIGIN: Madagascar ref: Dyr1409 |
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11.70 cts. Danburite single crystal
21.2 x 8.5 mm. Enhancement: none (N) The DANBURITE crystals is externally undamaged. |
stone PRICE
USD 90.00 ON HOLD ORIGIN: Madagascar ref: Dyr1170 |
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37.57cts. Danburite single crystal
25.2 x 17.5 mm. Enhancement: none (N) The DANBURITE crystals is externally undamaged.lightly rounded crystal |
stone PRICE
SOLD ORIGIN: Madagascar ref: Dyr3757 |
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¦ Facet Danburite ¦ 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: |  |
 Click on the picture to go to facet Danburite. |
| © 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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