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Hilgardite Mineral Data |
General Hilgardite Information |
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Ca2B5O9Cl•(H2O) | ||
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Molecular Weight = 331.67 gm | ||
Calcium 24.17 % Ca 33.82 % CaO | |||
Boron 16.30 % B 52.48 % B2O3 | |||
Hydrogen 0.61 % H 5.43 % H2O | |||
Chlorine 10.69 % Cl 10.69 % Cl | |||
- % Cl -2.41 % -O=Cl2 | |||
Oxygen 48.24 % O | |||
______ ______ | |||
100.00 % 100.00 % = TOTAL OXIDE | |||
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Ca2B5O9Cl•(H2O) | ||
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Minor borate mineral in salt deposits. | ||
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Approved IMA 1979 | ||
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Choctaw Salt Dome, Iberville Parish, Louisiana, USA Link to MinDat.org Location Data. | ||
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Named for Eugene W. Hilgard (1833-1916), German-American geologist, one of the first to describe the Loiuisiana salt dome deposits. | ||
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Hilgardite + Pronunciation ![]() |
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Hilgardite Image | |||
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Hilgardite Crystallography |
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a:b:c =0.9741:1:1.0156 | ||
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a = 6.297, b = 6.464, c = 6.565, Z = 1; alpha = 74.24°, beta = 61.68°, gamma = 61.26° V = 198.50 Den(Calc)= 2.77 | ||
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Triclinic - Pedial H-M Symbol (1) Space Group: P1 | ||
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By Intensity(I/Io): 2.88(1), 2.827(0.83), 2.029(0.64), | ||
Physical Properties of Hilgardite |
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{010} Perfect, {100} Perfect | ||
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Colorless. | ||
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2.69 | ||
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Transparent | ||
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5 - Apatite | ||
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Vitreous (Glassy) | ||
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white | ||
Optical Properties of Hilgardite |
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CI meas= -0.013 (Superior) - where the CI = (1-KPDmeas/KC) CI calc= -0.021 (Excellent) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.2409,KPDmeas= 0.2392,KC= 0.2361 Ncalc = 1.63 - 1.64 |
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Biaxial (+), a=1.63, b=1.636, g=1.664, bire=0.0340, 2V(Calc)=52, 2V(Meas)=35. | ||
Calculated Properties of Hilgardite |
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Bulk Density (Electron Density)=2.66 gm/cc note: Specific Gravity of Hilgardite =2.69 gm/cc. |
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Fermion Index = 0.03 Boson Index = 0.97 |
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PEHilgardite = 3.87 barns/electron U=PEHilgardite x rElectron Density= 10.30 barns/cc. |
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GRapi = 0 (Gamma Ray American Petroleum Institute Units) Hilgardite is Not Radioactive |
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Hilgardite Classification |
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26.05.14.01 (26)Hydrated Borates Containing Hydroxyl or Halogen | ||
(26.05)Dana Type | |||
(26.05.14)Hilgardite | |||
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06.ED.05 06 - BORATES | ||
06.E - Pentaborates | |||
06.ED -Tecto-pentaborates | |||
Other Hilgardite Information |
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NAME( Dana8) PHYS. PROP.(Am.Min.,Vol.78,p1313,1993) OPTIC PROP.(Am.Min.,Vol.78,p1313,1993) | ||
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Links to other databases for Hilgardite : 1 - Am. Min. Crystal Structure Database 2 - Athena 3 - GeoScienceWorld 4 - Google Images 5 - Google Scholar 6 - Handbook of Mineralogy (MinSocAm) 7 - Handbook of Mineralogy (UofA) 8 - MinDAT 9 - Mineralienatlas (Deutsch) 10 - Online Mineral Museum 11 - QUT Mineral Atlas 12 - Ruff.Info 13 - WWW-MINCRYST Search for Hilgardite using: Visit our Advertisers for Hilgardite : Ask about Hilgardite here : Print or Cut-and-Paste your Hilgardite Specimen Label here :
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