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 % 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

Empirical Formula:

Ca_0.94Mn²⁺_0.06Fe²⁺_0.94Mg_0.05Fe³⁺_0.99Al_0.03Mn²⁺_0.71Fe²⁺_0.29(Si₂O₇)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

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 - PrismaticH-M Symbol (2/m) Space Group: P 2₁/a

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 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

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

Zotov N , Kockelmann W , Jacobsen S D , Mitov I , Paneva D , Vassileva R D , Bonev I K , The Canadian Mineralogist , 43 (2005) p.1043-1053, Structure and cation order in manganilvaite:, a combined X-ray-diffraction, neutron-diffraction and mossbauer study, Sample: Ossikovo Pb-Zn skarn, Rhodope Mountains, Bulgaria, Sample: powder X-ray + neutron analysis

View Additional jPOWD Structure files for Manganilvaite
[1]

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	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**
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:

PE_{Manganilvaite}= 13.47 barns/electron
U=PE_{Manganilvaite} x rElectron 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

Search for Manganilvaite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Manganilvaite :

A Bijoux Google Search for Manganilvaite
Adam's Minerals Google Search for Manganilvaite
Cape Minerals Google Search for Manganilvaite
Dakota Matrix Minerals Google Search for Manganilvaite
Excalibur Mineral Corp. Google Search for Manganilvaite
Exceptional Minerals Google Search for Manganilvaite
John Betts Fine Minerals Search for Manganilvaite
McDougall Minerals Google Search for Manganilvaite
Mineral News Website Link
Rock and Mineral Shows Google Search for Manganilvaite
Weinrich Minerals, Inc. Google Search for Manganilvaite

Ask about Manganilvaite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

Print or Cut-and-Paste your Manganilvaite Specimen Label here :

Manganilvaite

CaFe++Fe+++(Mn,Fe++)(Si2O7)O(OH)
Dana No: 56.02.03.06 Strunz No: 09.BE.07
Locality:

Notes: