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Danburite Mineral Data |
General Danburite Information |
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CaB2(SiO4)2 | ||
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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 | |||
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100.00 % 100.00 % = TOTAL OXIDE | |||
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CaB2Si2O8 | ||
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Contact metamorphic rocks. | ||
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Valid Species (Pre-IMA) 1839 | ||
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Danbury, Connecticut. Link to MinDat.org Location Data. | ||
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Named after its location. | ||
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Danburite + Pronunciation ![]() |
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ICSD 6254 | ||
PDF 29-304 | |||
Danburite Image | |||
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Danburite Crystallography |
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a:b:c =0.9184:1:0.8822 | ||
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a = 8.048, b = 8.763, c = 7.731, Z = 4; V = 545.23 Den(Calc)= 3.00 | ||
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Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pnam | ||
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By Intensity(I/Io): 3.564(1), 2.654(0.75), 2.961(0.7), | ||
Physical Properties of Danburite |
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{001} Poor | ||
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Colorless, White, Gray, Brownish white, Straw yellow. | ||
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2.97 - 3.02, Average = 2.99 | ||
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Transparent to translucent | ||
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Sub Conchoidal - Fractures developed in brittle materials characterized by semi-curving surfaces. | ||
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Disseminated - Occurs in small, distinct particles dispersed in matrix. | ||
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Euhedral Crystals - Occurs as well-formed crystals showing good external form. | ||
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Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline). | ||
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7 - Quartz | ||
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Fluorescent and thermoluminescent (red), Short UV=violet blue, Long UV=blue to blue-green. | ||
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Vitreous - Greasy | ||
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white | ||
Optical Properties of Danburite |
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CI meas= -0.004 (Superior) - where the CI = (1-KPDmeas/KC) CI calc= -0.003 (Superior) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.211,KPDmeas= 0.2114,KC= 0.2104 Ncalc = 1.63 - 1.64 |
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Biaxial (+/-), a=1.63, b=1.633, g=1.636, bire=0.0060, 2V(Calc)=88, 2V(Meas)=88-90. Dispersion relatively strong. | ||
Calculated Properties of Danburite |
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Bulk Density (Electron Density)=2.98 gm/cc note: Specific Gravity of Danburite =3.00 gm/cc. |
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Fermion Index = 0.02 Boson Index = 0.98 |
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PEDanburite = 2.99 barns/electron U=PEDanburite x rElectron Density= 8.89 barns/cc. |
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GRapi = 0 (Gamma Ray American Petroleum Institute Units) Danburite is Not Radioactive |
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Danburite Classification |
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56.03.01.01 (56)Sorosilicate Si2O7 Groups and O, OH, F. and H2O | ||
(56.03)with [Si2O7] with borate groups | |||
(56.03.01)Danburite Goup | |||
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09.FA.65 09 - SILICATES (Germanates) | ||
09.F - Tektosilicates without Zeolitic H2O | |||
09.FA -Tektosilicates without additional non-tetrahedral anions, (Al,B):Si = 1:1 | |||
Other Danburite Information |
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NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32) | ||
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Links to other databases for Danburite : 1 - Am. Min. Crystal Structure Database 2 - Amethyst Galleries' Mineral Gallery 3 - Athena 4 - CalTech Mineral Spectroscopy 5 - EUROmin Project 6 - Ecole des Mines de Paris 7 - GeoScienceWorld 8 - Glendale Community College 9 - Google Images 10 - Google Scholar 11 - Handbook of Mineralogy (MinSocAm) 12 - Handbook of Mineralogy (UofA) 13 - HyperPhysics 14 - MinDAT 15 - Mineralienatlas (Deutsch) 16 - Online Mineral Museum 17 - QUT Mineral Atlas 18 - Ruff.Info 19 - Tradeshop.com - The Rainbow of Gems 20 - WWW-MINCRYST 21 - theimage Search for Danburite using: Visit our Advertisers for Danburite : Ask about Danburite here : Print or Cut-and-Paste your Danburite Specimen Label here :
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