Hilgardite  Mineral Data

Hilgardite Mineral Data

Search Webmineral :
   
Home Crystal jmol jPOWD Chem X Ray Dana Strunz Properties A to Z Images Share
      News Help About


General Hilgardite Information

Help on Chemical  Formula: Chemical Formula: Ca2B5O9Cl•(H2O)
Help on Composition: Composition: 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
Help on Empirical Formula: Empirical Formula: Ca2B5O9Cl•(H2O)
Help on Environment: Environment: Minor borate mineral in salt deposits.
Help on IMA Status: IMA Status: Approved IMA 1979
Help on Locality: Locality: Choctaw Salt Dome, Iberville Parish, Louisiana, USA Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Eugene W. Hilgard (1833-1916), German-American geologist, one of the first to describe the Loiuisiana salt dome deposits.
Help on Name Pronunciation: Name Pronunciation: Hilgardite + Pronunciation Say HILGARDITE
 

Hilgardite Image

Click Here for Larger Hilgardite Image in a New Browser Window Images:
Click Here for Larger Hilgardite Image

Hilgardite   Boracite

Comments: Sub-mm reddish orange crystals of hilgardite on white boracite.
Location: Boulby Mine, Loftus, Cleveland, Great Britain. Scale: 1.5 x 2.5 cm.
© John Veevaert

Hilgardite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.9741:1:1.0156
Help on Cell Dimensions: Cell Dimensions: 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
Help on Crystal System: Crystal System: Triclinic - PedialH-M Symbol (1) Space Group: P1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.88(1), 2.827(0.83), 2.029(0.64),
Click Here for Large Hilgardite Structure Window Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate

Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above


Ghose S , Wan C , American Mineralogist , 64 (1979) p.187-195, Hilgardite, Ca2[B5O9]Cl*H2O: a piezoelectric zeolite-type pentaborate

 

Physical Properties of Hilgardite

Help on Cleavage: Cleavage: {010} Perfect, {100} Perfect
Help on Color: Color: Colorless.
Help on Density: Density: 2.69
Help on Diaphaneity: Diaphaneity: Transparent
Help on Hardness: Hardness: 5 - Apatite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Hilgardite

Help on Gladstone-Dale: Gladstone-Dale: 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
Help on Optical Data: Optical Data: Biaxial (+), a=1.63, b=1.636, g=1.664, bire=0.0340, 2V(Calc)=52, 2V(Meas)=35.
 

Calculated Properties of Hilgardite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.66 gm/cc
note: Specific Gravity of Hilgardite =2.69 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.03
Boson Index = 0.97
Help on Photoelectric: Photoelectric: PEHilgardite = 3.87 barns/electron
U=PEHilgardite x rElectron Density= 10.30 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Hilgardite is Not Radioactive
 

Hilgardite Classification

Help on  Dana Class: Dana Class: 26.05.14.01 (26)Hydrated Borates Containing Hydroxyl or Halogen
  (26.05)Dana Type
  (26.05.14)Hilgardite
 
26.05.14.01 Hilgardite Ca2B5O9Cl•(H2O) P1 1
 
26.05.14.02 Kurgantaite! CaSr[B5O9]Cl•(H2O) P1 1
 
26.05.14.03 IMA2007-047! Pb2[B5O9]Cl•0.5H2O Pnn2 mm2
Help on  Strunz Class: Strunz Class: 06.ED.05 06 - BORATES
  06.E - Pentaborates
  06.ED -Tecto-pentaborates
 
06.ED.05 Hilgardite Ca2B5O9Cl•(H2O) P1 1
 
06.ED.05 Tyretskite Ca2B5O9(OH)•(H2O) P1 1
 
06.ED.05 Kurgantaite! CaSr[B5O9]Cl•(H2O) P1 1
 
06.ED.05 IMA2007-047! Pb2[B5O9]Cl•0.5H2O Pnn2 mm2
 

Other Hilgardite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Am.Min.,Vol.78,p1313,1993) OPTIC PROP.(Am.Min.,Vol.78,p1313,1993)
Help on See Also: See Also: 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:

Google
 
Web webmineral.com
[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Hilgardite :

A Bijoux Google Search for Hilgardite
Adam's Minerals Google Search for Hilgardite
Cape Minerals Google Search for Hilgardite
Dakota Matrix Minerals Google Search for Hilgardite
Excalibur Mineral Corp. Google Search for Hilgardite
Exceptional Minerals Google Search for Hilgardite
John Betts Fine Minerals Search for Hilgardite
McDougall Minerals Google Search for Hilgardite
Mineral News Website Link
Rock and Mineral Shows Google Search for Hilgardite
Weinrich Minerals, Inc. Google Search for Hilgardite

Ask about Hilgardite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Espaņol

Print or Cut-and-Paste your Hilgardite Specimen Label here :

Hilgardite

Ca2B5O9Cl•(H2O)
Dana No: 26.05.14.01 Strunz No: 06.ED.05
Locality:

 

Notes: