Mounanaite Mineral Data

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.

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-Ogoou?, 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

Diaphaniety:

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= 0.096 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2295,KPDmeas= 0.2247,KC= 0.2539

Optical Data:

Biaxial (?), b=2.09

Pleochroism (x):

brown red.

Pleochroism (z):

brown yellow.

Calculated Properties of Mounanaite

Electron Density:

r_electron=4.27 gm/cc
note: r_Mounanaite=4.75 gm/cc.

Fermion Index

Fermion Index = 0.0832
Boson Index = 0.9168

Photoelectric:

PE_Mounanaite= 616.79 barns/electron
U=PE_Mounanaite x r_electron=2,634.23 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Mounanaite is Not Radioactive

Mounanaite Classification

Dana Class:

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

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

(41.10.7)Dana Group

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

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

Strunz Class:

VII/B.29-80 VII - Phosphates, Arsenates and Vanadates

VII/B - Waterfree phosphates with unfamiliar anions F, Cl, O, OH. cations of medium and big size: Mg, Cu, Zn, and Ca, Na, K, Ba, Pb

VII/B.29 - Bjarebyite group

VII/B.29-10 Penikisite BaMg2Al2(PO4)3(OH)3 P1 1

VII/B.29-20 Kulanite Ba(Fe,Mn,Mg)2Al2(PO4)3(OH)3 P 2₁/m 2/m

VII/B.29-30 Bjarebyite (Ba,Sr)(Mn,Fe,Mg)2Al2(PO4)3(OH)3 P 2₁/m 2/m

VII/B.29-35 Johntomaite! Ba(Fe,Ca,Mn)2Fe2(PO4)3(OH)3 P 2₁/m 2/m

VII/B.29-40 Perloffite Ba(Mn,Fe)2Fe2(PO4)3(OH)3 P 2₁/m 2/m

VII/B.29-50 Jagowerite BaAl2(PO4)2(OH)2 P1 1

VII/B.29-60 Vesignieite Cu3Ba(VO4)2(OH)2 C 2/m 2/m

VII/B.29-70 Drugmanite Pb2(Fe,Al)H(PO4)2(OH)2 P 2₁/a 2/m

VII/B.29-80 Mounanaite PbFe2(VO4)2(OH)2 P1 1

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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

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Mounanaite

PbFe+++2(VO4)2(OH)2
Dana No: 41.10.7.1 Strunz No: VII/B.29-80
Locality:

Notes: