Gaudefroyite Mineral Data

Gaudefroyite Mineral Data
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General Gaudefroyite Information

Help on Chemical Formula: Chemical Formula: Ca4Mn+++3-x(BO3)3(CO3)(O,OH)3
Help on Composition: Composition: Molecular Weight = 582.85 gm
   Calcium    27.51 %  Ca   38.49 % CaO
   Manganese  23.56 %  Mn   33.86 % Mn2O3
   Boron       5.56 %  B    17.92 % B2O3
   Hydrogen    0.13 %  H     1.16 % H2O
   Carbon      2.06 %  C     7.55 % CO2
   Oxygen     41.18 %  O
             ______        ______ 
             100.00 %       98.97 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca4Mn3+2.5(BO3)3(CO3)O2.25(OH)0.75
Help on Environment: Environment: An uncommon hydrothermal mineral in manganese deposits.
Help on IMA Status: IMA Status: Approved IMA 1964
Help on Locality: Locality: Tachgagalt, 17 km south-southwest of Ouarzazate, Anti-Atlas Mountains, Morocco. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Abbe Christophe Gaudefroy (1888-1971), French mineralogist who worked in Morocco.
Help on Name Pronunciation: Name Pronunciation: Gaudefroyite + Pronunciation Say GAUDEFROYITE
Help on Synonym: Synonym: ICSD 66846
  PDF 17-154
 

Gaudefroyite Image

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Gaudefroyite

Comments: Dark gray, prismatic gaudefroyite with crystals to 1.5 cm.
Location: N'Chwaning Mine, Kalahari Manganese Field, Northern Cape Province, South Africa. Scale: 7.8 x 4.2 cm.
© John Veevaert

Gaudefroyite Crystallography
Help on Axial Ratios: Axial Ratios: a:c = 1:0.55633
Help on Cell Dimensions: Cell Dimensions: a = 10.589, c = 5.891, Z = 2; V = 572.04 Den(Calc)= 3.38
Help on Crystal System: Crystal System: Hexagonal - PyramidalH-M Symbol (6) Space Group: P 63
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.46(1), 2.62(1), 2.95(1),
Click Here for Large Gaudefroyite Structure Window Crystal Structure:

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drag1 - LMB Manipulate Structure
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Hoffmann C , Armbruster T , Kunz M , European Journal of Mineralogy , 9 (1997) p.7-19, Structure refinement of (001) disordered gaudefroyite Ca4Mn3[(BO3)3(CO3)O3]:, Jahn-Teller-distortion in edge-sharing chains of MnO6 octahedra

 

Physical Properties of Gaudefroyite

Help on Cleavage: Cleavage: None
Help on Color: Color: Black.
Help on Density: Density: 3.35 - 3.5, Average = 3.42
Help on Diaphaneity: Diaphaneity: Subopaque
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Hardness: Hardness: 6 - Orthoclase
Help on Luster: Luster: Adamantine - Resinous
Help on Streak: Streak: brown
 

Optical Properties of Gaudefroyite

Help on Dichroism (e): Dichroism (e): pale yellowish brown.
Help on Dichroism (w): Dichroism (w): red orange.
Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.108 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.123 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2707,KPDmeas= 0.2672,KC= 0.2411
Ncalc = 1.81 - 1.84
Help on Optical Data: Optical Data: Uniaxial (+), w=1.81, e=2.02, bire=0.2100.
Help on RL Anisotrophism: RL Anisotrophism: Strong in pale grays.
Help on RL Color: RL Color: Gray with strong yellow-orange to reddish internal reflections.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Gaudefroyite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 400 nm   11.20   15.40 
   
 420 nm   10.80   14.80 
 440 nm   10.40   14.20 
 460 nm   10.10   13.80 
 480 nm    9.90   13.40 
 500 nm    9.70   13.10 
 520 nm    9.60   12.80 
 540 nm    9.60   12.60 
 560 nm    9.50   12.30 
 580 nm    9.50   12.20 
 600 nm    9.40   12.10 
 620 nm    9.40   12.00 
 640 nm    9.30   11.90 
 660 nm    9.30   11.80 
 680 nm    9.30   11.70 
 700 nm    9.30   11.70 
Calculated Relative Intensity Colors of Gaudefroyite in Air
Relative
Intensity		    0% 100% 200% 300% 400% 500% 600% 700% 800% 900% 920%
R1                      
R2                      
 

Calculated Properties of Gaudefroyite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.34 gm/cc
note: Specific Gravity of Gaudefroyite =3.43 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEGaudefroyite = 9.52 barns/electron
U=PEGaudefroyite x rElectron Density= 31.80 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Gaudefroyite is Not Radioactive
 

Gaudefroyite Classification
Help on Dana Class: Dana Class: 27.01.02.01 (27)Compound Borates
  (27.01)Dana Type
  (27.01.02)Dana Group
 
27.01.02.01 Gaudefroyite Ca4Mn3-x(BO3)3(CO3)(O,OH)3 P 63 6
Help on Strunz Class: Strunz Class: 06.AB.60 06 - BORATES
  06.A - Monoborates
  06.AB -BO3, with additional anions; 1(D) + OH, etc.
 
06.AB.60 Gaudefroyite Ca4Mn3-x(BO3)3(CO3)(O,OH)3 P 63 6
 

Other Gaudefroyite Information
Help on References: References: NAME( AntBidBlaNic5) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic5)
Help on See Also: See Also: Links to other databases for Gaudefroyite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - CalTech Mineral Spectroscopy
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info
16 - WWW-MINCRYST

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Gaudefroyite

Ca4Mn+++3-x(BO3)3(CO3)(O,OH)3
Dana No: 27.01.02.01 Strunz No: 06.AB.60
Locality:

 

Notes: