Fianelite Mineral Data

Fianelite Mineral Data +

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General Fianelite Information

Chemical Formula:

Mn++2V+++++(V+++++,As+++++)O7·2(H2O)

Composition:

Molecular Weight = 365.78 gm

Manganese 30.04 % Mn 38.79 % MnO

Vanadium 24.37 % V 43.51 % V₂O₅

Arsenic 5.12 % As 7.85 % As₂O₅

Hydrogen 1.10 % H 9.85 % H₂O

Oxygen 39.37 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mn²⁺₂V⁵⁺V⁵⁺_0.75As_0.25O₇·2(H₂O)

Environment:

In iron and manganese ores.

IMA Status:

Approved IMA 1995 (Dana # Added)

Locality:

The Fianel mine, Val Ferrera, Canton Graubunden, Switzerland. Link to MinDat.org Location Data.

Name Origin:

Named after its locality.

Synonym:

ICSD 82414

IMA1995-016

PDF 49-1810

Fianelite Image

Images:

Fianelite

Comments: Small reddish-brown inclusions of fianelite in matrix.
Location: Fianel Mine, Val Ferrera, Grischun (Grisons; Graub?nden), Switzerland. Scale: Picture size 1 mm.
© Thomas Witzke / Abraxas-Verlag

Fianelite Crystallography

Axial Ratios:

a:b:c =0.5365:1:0.4606

Cell Dimensions:

a = 7.809, b = 14.554, c = 6.705, Z = 2; beta = 93.75° V = 760.41 Den(Calc)= 1.60

Crystal System:

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

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

By Intensity(I/I_o): 3.039(1), 5.32(0.8), 2.723(0.6),

Forms:

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Forms: [ 0 1 0] [ 1 1 0] [ 0 4 1] [ 0 1 1]

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Crystal Structure:

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Brugger J , Berlepsch P , American Mineralogist , 81 (1996) p.1270-1276, Description and crystal structure of fianelite, Mn2V(V,As)O7.2H2O, a new mineral, from Fianel, Val Ferrera, Graubunden, Switzerland

Physical Properties of Fianelite

Cleavage:

[001] Good, [100] Good

Color:

Orange red.

Density:

3.21 - 3.22, Average = 3.21

Diaphaniety:

Transparent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Encrustations - Forms crust-like aggregates on matrix.

Hardness:

3 - Calcite

Luster:

Vitreous - Adamantine

Streak:

orange

Optical Properties of Fianelite

Gladstone-Dale:

CI meas= 0.057 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.894 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.5125,KPDmeas= 0.2551,KC= 0.2706

Optical Data:

Biaxial (?), a=1.82, b=1.82, , 2V(Meas)=5-10. Dispersion small.

Calculated Properties of Fianelite

Electron Density:

r_electron=3.07 gm/cc
note: r_Fianelite=3.22 gm/cc.

Fermion Index

Fermion Index = 0.00079
Boson Index = 0.99921

Photoelectric:

PE_Fianelite= 15.97 barns/electron
U=PE_Fianelite x r_electron= 48.99 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Fianelite is Not Radioactive

Fianelite Classification

Dana Class:

40.5.16.1 (40)Hydrated Phosphates, etc

(40.5)with miscellaneous formulae

(40.5.16)Dana Group

40.5.16.1 Fianelite ! Mn2V(V,As)O7·2(H2O) P 2₁/n 2/m

Strunz Class:

VII/C.36-10 VII - Phosphates, Arsenates and Vanadates

VII/C - Water-bearing phosphates without unfamiliar anions, water-bearing diphosphates [P2O7]4-

VII/C.36 - Fianelite series

VII/C.36-10 Fianelite Mn2V(V,As)O7·2(H2O) P 2₁/n 2/m

Other Fianelite Information

References:

NAME( MinRec) PHYS. PROP.(Am.Min.,Vol.81,p1270-1276,1996) OPTIC PROP.(Am.Min.,Vol.81,p1270-1276,1996)

See Also:

Links to other databases for Fianelite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - Google Images
4 - Google Scholar
5 - Handbook of Mineralogy (MinSocAm)
6 - Handbook of Mineralogy (UofA)
7 - MinDAT
8 - MinMax(Deutsch)
9 - MinMax(English)
10 - Mineralienatlas (Deutsch)
11 - QUT Mineral Atlas
12 - Ruff.Info
13 - WWW-MINCRYST

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

Fianelite

Mn++2V+++++(V+++++,As+++++)O7·2(H2O)
Dana No: 40.5.16.1 Strunz No: VII/C.36-10
Locality:

Notes: