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DANBURITE                                  NATURAL COLOR                                  Hardness 7.5
 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 

 

   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
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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:

 

Click on the picture to go to Danburite crystal.

    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}]
 
 NaBSi3O8 C1- -1
 
 Danburite CaB2(SiO4)2 Pnam 2/m 2/m 2/m
Danburite 2 Danburite crystal
 
 
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