Barbertonite Mineral Data

Barbertonite Mineral Data
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General Barbertonite Information

Help on Chemical Formula: Chemical Formula: Mg6Cr2(CO3)(OH)16•4(H2O)
Help on Composition: Composition: Molecular Weight = 654.01 gm
   Magnesium  22.30 %  Mg   36.98 % MgO
   Chromium   15.90 %  Cr   23.24 % Cr2O3
   Hydrogen    3.70 %  H    33.06 % H2O
   Carbon      1.84 %  C     6.73 % CO2
   Oxygen     56.27 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mg6Cr2(CO3)(OH)16•4(H2O)
Help on Environment: Environment: Alteration product of chromite in serpentinite.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1940
Help on Locality: Locality: Kaapsehoop asbestos mine, Kaapse Hoop, Barberton district, Transvaal, South Africa. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Name Pronunciation: Name Pronunciation: Barbertonite + Pronunciation Say BARBERTONITE
 

Barbertonite Image

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Barbertonite

Comments: Crystalline, red barbertonite in white and green serpentinite rock.
Location: Nevada Creek, Tasmania, Australia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Barbertonite Crystallography
Help on Axial Ratios: Axial Ratios: a:c = 1:2.51539
Help on Cell Dimensions: Cell Dimensions: a = 6.17, c = 15.52, Z = 1; V = 511.67 Den(Calc)= 2.12
Help on Crystal System: Crystal System: Hexagonal - Dihexagonal DipyramidalH-M Symbol (6/m 2/m 2/m) Space Group: P 63/mmc
 

Physical Properties of Barbertonite

Help on Cleavage: Cleavage: {001} Perfect
Help on Color: Color: Violet, Pink, Pink violet.
Help on Density: Density: 2.1
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Fracture: Fracture: Flexible - Flexible fragments.
Help on Hardness: Hardness: 1.5-2 - Talc-Gypsum
Help on Luster: Luster: Pearly
Help on Streak: Streak: white
 

Optical Properties of Barbertonite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.035 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.044 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2561,KPDmeas= 0.2586,KC= 0.2679
Ncalc = 1.56 - 1.57
Help on Optical Data: Optical Data: Uniaxial (-), e=1.529, w=1.557, bire=0.0280.
 

Calculated Properties of Barbertonite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.14 gm/cc
note: Specific Gravity of Barbertonite =2.10 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.03
Boson Index = 0.97
Help on Photoelectric: Photoelectric: PEBarbertonite = 4.01 barns/electron
U=PEBarbertonite x rElectron Density= 8.59 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Barbertonite is Not Radioactive
 

Barbertonite Classification
Help on Dana Class: Dana Class: 16b.06.01.02 (16b)Carbonates - Hydroxyl or Halogen
  (16b.06)Dana Type
  (16b.06.01)Sjorgrenite-Hydrotalcite Group (Sojogrenite Subgroup:Hexagonal)
 
16b.06.01.01 Manasseite Mg6Al2(CO3)(OH)16•4(H2O) P 63/mmc 6/m 2/m 2/m
 
16b.06.01.02 Barbertonite Mg6Cr2(CO3)(OH)16•4(H2O) P 63/mmc 6/m 2/m 2/m
 
16b.06.01.03 Sjogrenite Mg6Fe2(CO3)(OH)16•4(H2O) P 63/mmc 6/m 2/m 2/m
 
16b.06.01.04 Zaccagnaite! Zn4Al2(OH)12(CO3)•3(H2O) P 63/mmc 6/m 2/m 2/m
Help on Strunz Class: Strunz Class: 05.DA.45 05 - CARBONATES (NITRATES)
  05.D - Carbonates with Additional Anions, with H2O
  05.DA -With medium-sized cations
 
05.DA.45 Brugnatellite Mg6Fe(CO3)(OH)13•4(H2O) P 63/mmc 6/m 2/m 2/m
 
05.DA.45 Barbertonite Mg6Cr2(CO3)(OH)16•4(H2O) P 63/mmc 6/m 2/m 2/m
 
05.DA.45 Chlormagaluminite (Mg,Fe)4Al2(OH)12(Cl2,CO3)•2(H2O) P 6/mcm, P 6cm, P 6c2 Hex
 
05.DA.45 Zaccagnaite! Zn4Al2(OH)12(CO3)•3(H2O) P 63/mmc 6/m 2/m 2/m
 
05.DA.45 Manasseite Mg6Al2(CO3)(OH)16•4(H2O) P 63/mmc 6/m 2/m 2/m
 
05.DA.45 Sjogrenite Mg6Fe2(CO3)(OH)16•4(H2O) P 63/mmc 6/m 2/m 2/m
 

Other Barbertonite Information
Help on References: References: NAME( AntBidBlaNic3) 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 Barbertonite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Barbertonite

Mg6Cr2(CO3)(OH)16•4(H2O)
Dana No: 16b.06.01.02 Strunz No: 05.DA.45
Locality:

 

Notes: