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 DANBURITE                              NATURAL COLOR                                Hardness 7.5

DANBURITE FACET

    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 

 

    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 

 

   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 

 

    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 

 

   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 

ORIGIN: Madagascar

ref: Dyr1170 

 

    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 

¦ Facet Danburite ¦        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: Click on the picture to go to facet  Danburite.
  © 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
 
 
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  Green Verdict Image
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