Mounanaite Mineral Data

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General Mounanaite Information

Chemical Formula:

PbFe+++2(VO4)2(OH)2

Composition:

Molecular Weight = 582.79 gm

Vanadium 17.48 % V 31.21 % V₂O₅

Iron 19.17 % Fe 27.40 % Fe₂O₃

Hydrogen 0.35 % H 3.09 % H₂O

Lead 35.55 % Pb 38.30 % PbO

Oxygen 27.45 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

PbFe³⁺₂(VO₄)₂(OH)₂

Environment:

Seconary mineral in a U-V ore deposit.

IMA Status:

Approved IMA 1969

Locality:

Mounana mine, Franceville, Haute Ogooue, Gabon. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Name Pronunciation:

Mounanaite + Pronunciation

Synonym:

ICSD 76616

PDF 22-657

Mounanaite Image

Images:

Mounanaite

Comments: Yellow crystal of mounanaite on matrix.
Location: Mounana, Haut-Ogoue, Gabon. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Images:

Mounanaite Francevillite

Comments: Stout, yellow, transparent, prismatic, striated crystals of francevillite on brownish red mounanaite matrix.
Location: Mounana mine, Franceville, Haut-Ogooué, Gabon. Scale: Picture size 1.5 cm.
© Paul M. Schumacher

Mounanaite Crystallography

Axial Ratios:

a:b:c =0.7245:1:0.7258

Cell Dimensions:

a = 5.55, b = 7.66, c = 5.56, Z = 1; alpha = 111.02°, beta = 112.12°, gamma = 94.15° V = 203.87 Den(Calc)= 4.75

Crystal System:

Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1

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

By Intensity(I/I_o): 4.66(1), 2.77(0.8), 4.56(0.8),

Crystal Structure:

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drag2 - RMB Resize/Rotate
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Krause W , Belendorff K , Bernhardt H J , McCammon C A , Effenberger H , Mikenda W , European Journal of Mineralogy , 10 (1998) p.179-206, Crystal chemistry of the tsumcorite-group minerals. New data on ferrilotharmeyerite,, tsumcorite, thometzekite, mounanaite, helmutwinklerite, and a redefinition of gartrellite

Physical Properties of Mounanaite

Color:

Brownish red.

Density:

4.85

Diaphaneity:

Translucent

Habit:

Tabular - Form dimensions are thin in one direction.

Habit:

Twinning Common - Crystals are usually twinned.

Optical Properties of Mounanaite

Gladstone-Dale:

CI meas= 0.115 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.12 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2234,KPDmeas= 0.2247,KC= 0.2539
Ncalc = 2.23 - 2.24

Optical Data:

Biaxial (?), b=2.09

Pleochroism (x):

brown red.

Pleochroism (z):

brown yellow.

Calculated Properties of Mounanaite

Electron Density:

Bulk Density (Electron Density)=4.36 gm/cc
note: Specific Gravity of Mounanaite =4.85 gm/cc.

Fermion Index:

Fermion Index = 0.08
Boson Index = 0.92

Photoelectric:

PE_Mounanaite= 616.79 barns/electron
U=PE_Mounanaite x rElectron Density=2,689.69 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Mounanaite is Not Radioactive

Mounanaite Classification

Dana Class:

41.10.07.01 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen

(41.10)where (A++ B++)3 (XO4)2 Zq

(41.10.07)Mounanaite Group

41.10.07.01 Mounanaite PbFe2(VO4)2(OH)2 P1 1

41.10.07.02 Krettnichite! PbMn2(VO4)2(OH)2 C 2/m 2/m

Strunz Class:

08.CG.15 08 - PHOSPHATES, ARSENATES, VANADATES

08.C - Phosphates without Additional Anions, with H2O

08.CG -With large and medium-sized cations, RO4:H2O = 1:1

08.CG.15 Cobaltlotharmeyerite! Ca(Co,Fe,Ni)2(AsO4)2(OH,H2O)2 C 2/m 2/m

08.CG.15 Ferrilotharmeyerite Ca(Zn,Cu)(Fe,Zn)(AsO4)2(OH,H2O)2 C 2/m 2/m

08.CG.15 Cabalzarite! Ca(Mg,Al,Fe)2(AsO4)2(H2O,OH)2 C 2/m 2/m

08.CG.15 Mawbyite Pb(FeZn)2(AsO4)2(OH,H2O)2 C 2/m 2/m

08.CG.15 Lotharmeyerite CaZnMn(AsO3OH)4(OH)3 C 2/m,C 2,Cm Mono

08.CG.15 Mounanaite PbFe2(VO4)2(OH)2 P1 1

08.CG.15 Tsumcorite PbZnFe(AsO4)2•(H2O) C 2/m 2/m

08.CG.15 Thometzekite Pb(Cu,Zn)2(AsO4)2•2(H2O) C 2/m 2/m

08.CG.15 Cobalttsumcorite! Pb(Co,Fe)2(AsO4)2(OH,H2O)2 C 2/m 2/m

08.CG.15 Manganlotharmeyerite! Ca(Mn,Mg,)2(AsO4)2(OH,H2O)2 C 2/m 2/m

08.CG.15 Nickellotharmeyerite! Ca(Ni,Fe,Co)2(AsO4)2(OH,H2O)2 C 2/m 2/m

08.CG.15 Krettnichite! PbMn2(VO4)2(OH)2 C 2/m 2/m

08.CG.15 Schneebergite! Bi(Co,Ni)2(AsO4)2(OH,H2O)2 C 2/m 2/m

08.CG.15 Nickelschneebergite! Bi(Ni,Co)2(AsO4)2(OH,H2O)2 C 2/m 2/m

Other Mounanaite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Mounanaite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Mounanaite

PbFe+++2(VO4)2(OH)2
Dana No: 41.10.07.01 Strunz No: 08.CG.15
Locality:

Notes: