Turtmannite Mineral Data


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General Turtmannite Information

Help on Chemical  Formula: Chemical Formula: (Mn,Mg)25.5[(V,As)O4]3(SiO4)3[AsO3]xO5-5x(OH)20+x
Help on Composition: Composition: Molecular Weight = 2,396.92 gm
   Magnesium   2.54 %  Mg    4.20 % MgO
   Manganese  52.72 %  Mn   68.07 % MnO
   Vanadium    4.78 %  V     8.54 % V2O5
   Silicon     3.52 %  Si    7.52 % SiO2
   Arsenic     3.28 %  As    1.24 % As2O3 /  3.60 % As2O5
   Hydrogen    0.84 %  H     7.53 % H2O
   Oxygen     32.33 %  O
             ______        ______ 
             100.00 %      100.69 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mn2+23Mg2.5(VO4)2.25(AsO4)0.75(SiO4)3(AsO3)0.3O3.5(OH)20.03
Help on Environment: Environment: Manganoan paleokarst lenses in Triassic marbles metamorphosed to upper greenshist facies. Similar to mcgovernite; structure
Help on IMA Status: IMA Status: Approved IMA 2000 (Dana # Added)
Help on Locality: Locality: Barrhorn Unit (Central Alps) in the Triassic marbles near Turtmanntal, Valais, Switzerland. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after the locality.
 

Turtmannite Image

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Turtmannite

Comments: Orange-brownish grains of turtmannite in matrix.
Location: Pipji Glacier, Turtmanntal (Turtmann Valley), Wallis (Valais), Switzerland. Scale: Picture size 4 mm.
© Thomas Witzke / Abraxas-Verlag

Turtmannite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:2.47003
Help on Cell Dimensions: Cell Dimensions: a = 8.259, c = 20.4, Z = 1; V = 1,205.08 Den(Calc)= 3.30
Help on Crystal System: Crystal System: Trigonal - Hexagonal ScalenohedralH-M Symbol (3 2/m) Space Group: R 3c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.86(1), 1.559(0.9), 3.26(0.8),4.13(0.7), 2.38(0.6), 3.46(0.6), 2.35(0.5),
Click Here for Large Turtmannite Structure Window Crystal Structure:

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Brugger J , Armbruster T , Meisser N , Hejny C , Grobety B , American Mineralogist , 86 (2001) p.1494-1505, Description and crystal structure of turtmannite, a new mineral with a, 68 Angstrom period related to mcgovernite, Note: z-coordinate of Mn12 has been modified

 

Physical Properties of Turtmannite

Help on Cleavage: Cleavage: [0001] Perfect
Help on Color: Color: Bright yellow, Orange.
Help on Density: Density: 3.6 - 4, Average = 3.8
Help on Diaphaniety: Diaphaniety: Transparent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Anhedral Grains - Granular minerals without the expression of crystal shapes
Help on Habit: Habit: Micaceous - Platy texture with "flexible" plates.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: colorless
 

Optical Properties of Turtmannite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.053 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.091 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2385,KPDmeas= 0.2071,KC= 0.2186
Help on Optical Data: Optical Data: Uniaxial (-), e=1.787.
 

Calculated Properties of Turtmannite

Help on Electron Density: Electron Density:

relectron=3.62 gm/cc
note: rTurtmannite =3.80 gm/cc.

Help on Fermion Index Fermion Index Fermion Index = 0.00445
Boson Index = 0.99555
Help on Photoelectric: Photoelectric:

PETurtmannite = 17.04 barns/electron
U=PETurtmannite x relectron= 61.62 barns/cc.

Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Turtmannite is Not Radioactive

 

Turtmannite Classification

Help on  Dana Class: Dana Class: 43.4.9.2 (43)Compound Phosphates, etc.
  (43.4)(Anhydrous Compound Anions With Hydroxyl or Halogen)
  (43.4.9)Dana Group
 
43.4.9.1 Mcgovernite Mn9Mg4Zn2As2Si2O17(OH)14 R 3c 3 2/m
 
43.4.9.2 Turtmannite ! (Mn,Mg)25.5[(V,As)O4]3(SiO4)3[AsO3]xO5-5x(OH)20x R 3c 3 2/m
Help on  Strunz Class: Strunz Class: VIII/B.11-15 VIII - Silicates
  VIII/B - Nesosubsilicates, with anions unfamiliar to tetraheders, cations of octahedral and tetrahedral orientation [4/6]
  VIII/B.11 - Dixenite - Kraisslite series
 
VIII/B.11-10 Dixenite CuMn14Fe(AsO3)5(SiO4)2(AsO4)(OH)6 R 3 3
 
VIII/B.11-15 Turtmannite (Mn,Mg)25.5[(V,As)O4]3(SiO4)3[AsO3]xO5-5x(OH)20x R 3c 3 2/m
 
VIII/B.11-20 Mcgovernite Mn9Mg4Zn2As2Si2O17(OH)14 R 3c 3 2/m
 
VIII/B.11-30 Kraisslite (Mn,Mg)24Zn3Fe(AsO3)2(AsO4)3(SiO4)6(OH)18 P 6322 6 2 2
 
VIII/B.11-40 Asbecasite Ca3(Ti,Sn)As6Si2Be2O20 P 3c 3m
 

Other Turtmannite Information

Help on References: References: NAME( AmMin, Vol 86, p 1494-1505) PHYS. PROP.(AmMin, Vol 86, p 1494-1505) OPTIC PROP.(AmMin, Vol 86, p 1494-1505)
Help on See Also: See Also: Links to other databases for Turtmannite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

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Turtmannite

(Mn,Mg)25.5[(V,As)O4]3(SiO4)3[AsO3]xO5-5x(OH)20+x
Dana No: 43.4.9.2 Strunz No: VIII/B.11-15
Locality:

 

Notes:

 

 
   
 
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