Manganilvaite Mineral Data
General Manganilvaite Information
Chemical Formula:
CaFe++Fe+++(Mn,Fe++)(Si2O7)O(OH)
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 % Al2 O3
Iron 30.45 % Fe 21.70 % FeO / 19.41 % Fe2 O3
Silicon 13.80 % Si 29.51 % SiO2
Hydrogen 0.25 % H 2.21 % H2 O
Oxygen 35.37 % O
______ ______
100.00 % 100.08 % = TOTAL OXIDE
Empirical Formula:
Ca0.94 Mn2+ 0.06 Fe2+ 0.94 Mg0.05 Fe3+ 0.99 Al0.03 Mn2+ 0.71 Fe2+ 0.29 (Si2 O7 )O(OH)
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.
IMA Status:
Approved IMA 2002 (Dana # Added)
Locality:
Pb-Zn skarn deposits in the Rhodope Mountains, Bulgaria Link to MinDat.org Location Data.
Name Origin:
Named as the Mn analogue of ilvaite with which it forms a continuous solid solution.
Synonym:
IMA2002-016
Manganilvaite Image
Images:
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
Axial Ratios:
a:b:c =1.4715:1:0.6607
Cell Dimensions:
a = 13.025, b = 8.8514, c = 5.8486, Z = 4; beta = 90.167° V = 674.28 Den(Calc)= 4.01
Crystal System:
Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21 /a
X Ray Diffraction:
By Intensity(I/Io ): 2.718(1)(1 12,112 ), 2.848(0.9)(401,4 01 2.875(0.85)(130
2.687(0.7)(230), 1.475(0.48)(060,252,5 23 2.18(0.48)(140 2.111(0.47)(322.4 12,412 1.716(0.39)(720 1.49
Physical Properties of Manganilvaite
Cleavage:
{100} Distinct
Color:
Black.
Density:
3.92
Diaphaneity:
Opaque
Fracture:
Brittle - Uneven - Very brittle fracture producing uneven fragments.
Habit:
Pyramidal - Crystals are shaped like pyramids.
Habit:
Striated - Parallel lines on crystal surface or cleavage face.
Hardness:
5.5-6 - Knife Blade-Orthoclase
Luster:
Vitreous (Glassy)
Streak:
brownish Black
Optical Properties of Manganilvaite
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
RL Anisotrophism:
Strong in blue-grayish.
RL Color:
Gray to bluish gray with red internal reflections.
RL Pleochroism:
Bluish gray to lilac brown.
Reflectivity
Standardized Intensity (100%) Reflection Spectra of Manganilvaite in Air
λ
R1
R 2
∑ 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
Relative Intensity
0%
100%
200%
300%
400%
500%
600%
700%
800%
900%
1000%
R1
R2
Calculated Properties of Manganilvaite
Electron Density:
Bulk Density (Electron Density)=3.90 gm/cc note: Specific Gravity of Manganilvaite =4.01 gm/cc.
Fermion Index:
Fermion Index = 0.01 Boson Index = 0.99
Photoelectric:
PEManganilvaite = 13.47 barns/electronU=PEManganilvaite x r Electron Density= 52.49 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Manganilvaite is Not Radioactive
Manganilvaite Classification
Dana Class:
56.02.03.06 (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
56.02.03.01 Lawsonite CaAl2Si2O7(OH)2•(H2O) Ccmm 2/m 2/m 2/m
56.02.03.02 Hennomartinite SrMn2Si2O7(OH)2•(H2O) C mcm 2/m 2/m 2/m
56.02.03.03 Ilvaite CaFe2FeSi2O7O(OH) Pbnm 2/m 2/m 2/m
56.02.03.04 Noelbensonite ! BaMn2(Si2O7)(OH)2•(H2O) C mcm 2/m 2/m 2/m
56.02.03.05 Itoigawaite ! SrAl2Si2O7(OH)2•(H2O) C mcm 2/m 2/m 2/m
56.02.03.06 Manganilvaite ! CaFeFe(Mn,Fe)(Si2O7)O(OH) P 21 /a 2/m
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
References:
NAME( AmMin, v91, p712) PHYS. PROP.(AmMin, v91, p712) OPTIC PROP.(AmMin, v91, p712)
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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Manganilvaite
CaFe++Fe+++(Mn,Fe++)(Si2O7)O(OH)
Dana No: 56.02.03.06 Strunz No: 09.BE.07
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