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 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 ON HOLD 

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
 
 
Will ship Worldwide
  Green Verdict Image
© 1987 - 2015  gggems.com  All rights reserved.