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Manganilvaite Mineral Data

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General Manganilvaite Information

Help on Chemical  Formula: Chemical Formula: CaFe++Fe+++(Mn,Fe++)(Si2O7)O(OH)
Help on Composition: Composition: Molecular Weight = 407.15 gm
   Calcium     9.25 %  Ca   12.95 % CaO
   Magnesium   0.30 %  Mg    0.49 % MgO
   Manganese  10.39 %  Mn   13.42 % MnO
   Aluminum    0.20 %  Al    0.38 % Al2O3
   Iron       30.45 %  Fe   21.70 % FeO / 19.41 % Fe2O3
   Silicon    13.80 %  Si   29.51 % SiO2
   Hydrogen    0.25 %  H     2.21 % H2O
   Oxygen     35.37 %  O
             ______        ______ 
             100.00 %      100.08 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca0.94Mn2+0.06Fe2+0.94Mg0.05Fe3+0.99Al0.03Mn2+0.71Fe2+0.29(Si2O7)O(OH)
Help on Environment: Environment: Marble-hosted skarn-type orebodies at the Ossikovo and Mogilata deposits (Madan ore district) and the Govedarnika deposit (Laki district). Mn-dominant analogue of ilvaite.
Help on IMA Status: IMA Status: Approved IMA 2002 (Dana # Added)
Help on Locality: Locality: Pb-Zn skarn deposits in the Rhodope Mountains, Bulgaria Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named as the Mn analogue of ilvaite with which it forms a continuous solid solution.
Help on Synonym: Synonym: IMA2002-016

Manganilvaite Image

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  Manganilvaite   Manganilvaite

Comments: Small, black, very bright crystals of manganilvaite on a matrix of clear quartz, white calcite, and tiny brassy pyrite crystals.
Location: Daye mining area, Hubei, China. Scale: 6 x 5.6 x 3.7 cm.
© Fabre Minerals

Manganilvaite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.4715:1:0.6607
Help on Cell Dimensions: Cell Dimensions: a = 13.025, b = 8.8514, c = 5.8486, Z = 4; beta = 90.167° V = 674.28 Den(Calc)= 4.01
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/a
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.718(1)(112,112 ), 2.848(0.9)(401,401 2.875(0.85)(130 2.687(0.7)(230), 1.475(0.48)(060,252,523 2.18(0.48)(140 2.111(0.47)(322.412,412 1.716(0.39)(720 1.49

Physical Properties of Manganilvaite

Help on Cleavage: Cleavage: {100} Distinct
Help on Color: Color: Black.
Help on Density: Density: 3.92
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Brittle - Uneven - Very brittle fracture producing uneven fragments.
Help on Habit: Habit: Pyramidal - Crystals are shaped like pyramids.
Help on Habit: Habit: Striated - Parallel lines on crystal surface or cleavage face.
Help on Hardness: Hardness: 5.5-6 - Knife Blade-Orthoclase
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: brownish Black

Optical Properties of Manganilvaite

Help on Optical Data: Optical Data: NCalc= 1.91 - from Gladstone-Dale relationship (KC = 0.2262) where Ncalc=Dcalc*KC+1
NCalc= 1.89 - from Gladstone-Dale relationship (KC = 0.2262) where Ncalc=Dmeas*KC+1
Help on RL Anisotrophism: RL Anisotrophism: Strong in blue-grayish.
Help on RL Color: RL Color: Gray to bluish gray with red internal reflections.
Help on RL Pleochroism: RL Pleochroism: Bluish gray to lilac brown.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Manganilvaite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 460 nm    8.30   10.00 
 540 nm    7.50    9.80 
 580 nm    7.00    9.70 
 640 nm    6.10    9.50 
Calculated Relative Intensity Colors of Manganilvaite in Air
   0% 100% 200% 300% 400% 500% 600% 700% 800% 900% 1000%

Calculated Properties of Manganilvaite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.90 gm/cc
note: Specific Gravity of Manganilvaite =4.01 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEManganilvaite = 13.47 barns/electron
U=PEManganilvaite x rElectron Density= 52.49 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Manganilvaite is Not Radioactive

Manganilvaite Classification

Help on  Dana Class: Dana Class: (56)Sorosilicate Si2O7 Groups and O, OH, F. and H2O
  (56.02)with cations in [4] and/or >[4] coordination
  (56.02.03)Lawsonite - Ilvaite group Lawsonite CaAl2Si2O7(OH)2•(H2O) Ccmm 2/m 2/m 2/m Hennomartinite SrMn2Si2O7(OH)2•(H2O) C mcm 2/m 2/m 2/m Ilvaite CaFe2FeSi2O7O(OH) Pbnm 2/m 2/m 2/m Noelbensonite! BaMn2(Si2O7)(OH)2•(H2O) C mcm 2/m 2/m 2/m Itoigawaite! SrAl2Si2O7(OH)2•(H2O) C mcm 2/m 2/m 2/m Manganilvaite! CaFeFe(Mn,Fe)(Si2O7)O(OH) P 21/a 2/m
Help on  Strunz Class: Strunz Class: 09.BE.07 09 - SILICATES (Germanates)
  09.B - Sorosilicates
  09.BE -Si2O7 groups with additional anions;
09.BE.07 Ilvaite CaFe2FeSi2O7O(OH) Pbnm 2/m 2/m 2/m
09.BE.07 Manganilvaite! CaFeFe(Mn,Fe)(Si2O7)O(OH) P 21/a 2/m

Other Manganilvaite Information

Help on References: References: NAME( AmMin, v91, p712) PHYS. PROP.(AmMin, v91, p712) OPTIC PROP.(AmMin, v91, p712)
Help on See Also: See Also: Links to other databases for Manganilvaite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Dana No: Strunz No: 09.BE.07





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