IMA2002-016 Mineral Data

IMA2002-016 Mineral Data

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General IMA2002-016 Information

Chemical Formula:

CaFe++Fe+++(Mn,Fe++)(Si2O7)O(OH)

Composition:

Molecular Weight = 408.11 gm

Calcium 9.82 % Ca 13.74 % CaO

Manganese 10.10 % Mn 13.04 % MnO

Iron 30.79 % Fe 22.01 % FeO / 19.56 % Fe₂O₃

Silicon 13.76 % Si 29.45 % SiO₂

Hydrogen 0.25 % H 2.21 % H₂O

Oxygen 35.28 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

CaFe²⁺Fe³⁺Mn²⁺_0.75Fe²⁺_0.25(Si₂O₇)O(OH)

Environment:

Mn-dominant analogue of ilvaite.

IMA Status:

Proposed IMA 2002 (Dana # Added)

Locality:

Link to MinDat.org Location Data.

Name Origin:

Commission on New Minerals and Mineral Names (CNMMN)

IMA2002-016 Image

Images:

IMA2002-016 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

IMA2002-016 Crystallography

Axial Ratios:

a:b:c =1.4715:1:0.6607

Cell Dimensions:

a = 13.0246, b = 8.8511, c = 5.8485, Z = 4; beta = 90.17° V = 674.22 Den(Calc)= 4.02

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), 2.848(0.9), 2.875(0.85),2.687(0.7), 1.475(0.48), 2.18(0.48), 2.111(0.47),

Physical Properties of IMA2002-016

Color:

Black.

Diaphaniety:

Opaque

Luster:

Vitreous (Glassy)

Optical Properties of IMA2002-016

RL Anisotrophism:

Strong in blue-grayish.

RL Color:

Gray to bluish gray with red internal reflections.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of IMA2002-016 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 IMA2002-016 in Air**
Relative Intensity	0%	100%	200%	300%	400%	500%	600%	700%	800%	900%	1000%
R₁
R₂

Calculated Properties of IMA2002-016

Electron Density:

r_electron=3.91 gm/cc
note: r_IMA2002-016=4.02 gm/cc.

Fermion Index

Fermion Index = 0.01325
Boson Index = 0.98675

Photoelectric:

PE_IMA2002-016= 13.56 barns/electron
U=PE_IMA2002-016 x r_electron= 52.95 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

IMA2002-016 is Not Radioactive

IMA2002-016 Classification

Dana Class:

56.2.3.6 (56)Sorosilicate Si2O7 Groups and O, OH, F. and H2O

(56.2)with cations in [4] and/or >[4] coordination

(56.2.3)Lawsonite - Ilvaite group

56.2.3.1 Lawsonite CaAl2Si2O7(OH)2·(H2O) Ccmm 2/m 2/m 2/m

56.2.3.2 Hennomartinite SrMn2Si2O7(OH)2·(H2O) C mcm 2/m 2/m 2/m

56.2.3.3 Ilvaite CaFe2FeSi2O7O(OH) Pbnm 2/m 2/m 2/m

56.2.3.4 Noelbensonite! BaMn2(Si2O7)(OH)2·(H2O) C mcm 2/m 2/m 2/m

56.2.3.5 Itoigawaite! SrAl2Si2O7(OH)2·(H2O) C mcm 2/m 2/m 2/m

56.2.3.6 IMA2002-016 ! CaFeFe(Mn,Fe)(Si2O7)O(OH) P 2₁/a 2/m

Strunz Class:

VIII/CX.00-00 VIII - Silicates

VIII/CX - Unclassified Strunz Sorosilicates

VIII/CX.00 - Lawsonite Group

Other IMA2002-016 Information

See Also:

Links to other databases for IMA2002-016 :
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)

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Print or Cut-and-Paste your IMA2002-016 Specimen Label here :

IMA2002-016

CaFe++Fe+++(Mn,Fe++)(Si2O7)O(OH)
Dana No: 56.2.3.6 Strunz No: VIII/CX.00-00
Locality:

Notes: