Cahnite Mineral Data

Cahnite Mineral Data
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General Cahnite Information

Help on Chemical Formula: Chemical Formula: Ca2B(AsO4)(OH)4
Help on Composition: Composition: Molecular Weight = 297.91 gm
   Calcium   26.91 %  Ca   37.65 % CaO
   Boron      3.63 %  B    11.68 % B2O3
   Arsenic   25.15 %  As   38.57 % As2O5
   Hydrogen   1.35 %  H    12.09 % H2O
   Oxygen    42.96 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca2B(AsO4)(OH)4
Help on Environment: Environment: A late-stage mineral in pegmatites cutting a metamorphosed stratiform zinc orebody.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1927
Help on Locality: Locality: From Franklin, Sussex Co., New Jersey, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Lazard Cahn (1865-1940), mineral collector and dealer, Colorado Springs, Colorado, USA, who first noted the species.
Help on Name Pronunciation: Name Pronunciation: Cahnite Say CAHNITE
Help on Synonym: Synonym: ICSD 27527
  PDF 13-158
 

Cahnite Image

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Cahnite

Comments: White, translucent cahnite crystal on hodgkinsonite.
Location: Franklin, Sussex County, New Jersey, USA. Scale: Size Not Given.
© Lou Perloff / Photo Atlas of Minerals

Cahnite Crystallography
Help on Axial Ratios: Axial Ratios: a:c = 1:0.87244
Help on Cell Dimensions: Cell Dimensions: a = 7.095, c = 6.19, Z = 2; V = 311.60 Den(Calc)= 3.18
Help on Crystal System: Crystal System: Tetragonal - DisphenoidalH-M Symbol (4) Space Group: I 4
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.56(1), 1.818(0.55), 2.64(0.5),
Help on Forms: Forms:

Mouse
Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize
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M - Menu
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Forms: ( 0 1 0) ( 1 1 0) ( 1 1 1)

Warning: this large pop-up is very compute intensive and may not work well with some computers.
Click Here for Large Cahnite Structure Window Crystal Structure:

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drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
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Prewitt C T , Buerger M J , American Mineralogist , 46 (1961) p.1077-1085, The crystal structure of cahnite, Ca2BAsO4(OH)4

 

Physical Properties of Cahnite

Help on Cleavage: Cleavage: {???} Perfect
Help on Color: Color: Colorless, White.
Help on Density: Density: 3.16
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Hardness: Hardness: 3 - Calcite
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous (Glassy)
Help on Magnetism: Magnetism: Nonmagnetic
Help on Streak: Streak: white
 

Optical Properties of Cahnite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.009 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.003 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2083,KPDmeas= 0.2097,KC= 0.2078
Ncalc = 1.66
Help on Optical Data: Optical Data: Uniaxial (+), w=1.662, e=1.663, bire=0.0010.
 

Calculated Properties of Cahnite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.12 gm/cc
note: Specific Gravity of Cahnite =3.18 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0077923115
Boson Index = 0.9922076885
Help on Photoelectric: Photoelectric: PECahnite = 20.05 barns/electron
U=PECahnite x rElectron Density= 62.50 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Cahnite is Not Radioactive
 

Cahnite Classification
Help on Dana Class: Dana Class: 43.04.04.01 (43)Compound Phosphates, etc.
  (43.04)(Anhydrous Compound Anions With Hydroxyl or Halogen)
  (43.04.04)Dana Group
 
43.04.04.01 Cahnite Ca2B(AsO4)(OH)4 I 4 4
Help on Strunz Class: Strunz Class: 06.AC.70 06 - BORATES
  06.A - Monoborates
  06.AC -B(O,OH)4, without and with additional anions; 1(T), 1(T)+OH, etc.
 
06.AC.70 Cahnite Ca2B(AsO4)(OH)4 I 4 4
 

Other Cahnite Information
Help on References: References: NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Cahnite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - Franklin Minerals(Dunn)
6 - Franklin Minerals(Palache)
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - MinMax(Deutsch)
13 - MinMax(English)
14 - Mineralienatlas (Deutsch)
15 - QUT Mineral Atlas
16 - Ruff.Info
17 - WWW-MINCRYST

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Cahnite

Ca2B(AsO4)(OH)4
Dana No: 43.04.04.01 Strunz No: 06.AC.70
Locality:

 

Notes: