Finnemanite Mineral Data

Finnemanite Mineral Data +

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General Finnemanite Information

Chemical Formula:

Pb5(As+++O3)3Cl

Composition:

Molecular Weight = 1,440.21 gm

Arsenic 15.61 % As 20.61 % As₂O₃

Lead 71.93 % Pb 77.49 % PbO

Chlorine 2.46 % Cl 2.46 % Cl

- % Cl -0.56 % -O=Cl₂

Oxygen 10.00 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Pb₅(AsO₃)₃Cl

IMA Status:

Valid Species (Pre-IMA) 1923

Locality:

Långban mine, Bergslagen ore district, Filipstad, Värmland (Wermland), Sweden. Link to MinDat.org Location Data.

Name Origin:

Named for K.J. Finneman who discovered the mineral.

Synonym:

ICSD 100168

PDF 14-1887

Finnemanite Image

Images:

Finnemanite

Comments: Black, prismatic, twinned crystal of finnemanite.
Location: L?ngban, Filipstad, V?rmland, Sweden. Scale: Crystal length 4.5 mm.
© Thomas Witzke / Abraxas-Verlag

Finnemanite Crystallography

Axial Ratios:

a:c = 1:0.68426

Cell Dimensions:

a = 10.23, c = 7, Z = 2; V = 634.42 Den(Calc)= 7.54

Crystal System:

Hexagonal - PyramidalH-M Symbol (6) Space Group: P 6₃

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

By Intensity(I/I_o): 3.03(1), 2.88(0.9), 3.35(0.6),

Forms:

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Crystal Structure:

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Effenberger H , Pertlik F , Tschermaks Mineralogische und Petrographische Mitteilungen , 26 (1979) p.95-107, Die kristallstruktur des finnemanits, Pb5Cl(AsO3)3, mit einem, vergleich zum strukturtyp des chlorapatits, Ca5Cl(PO4)3, Locality: Langban, Varmland, Sweden

View Additional jPOWD Structure files for Finnemanite
[1] [2]

Physical Properties of Finnemanite

Cleavage:

[1011] Distinct

Color:

Gray, Black.

Density:

7.265

Diaphaniety:

Translucent to Opaque

Hardness:

2.5 - Finger Nail

Luster:

Subadamantine

Optical Properties of Finnemanite

Gladstone-Dale:

CI meas= -0.115 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.074 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1711,KPDmeas= 0.1775,KC= 0.1593

Optical Data:

Uniaxial (-), e=2.2847, w=2.2949, bire=0.0102.

Calculated Properties of Finnemanite

Electron Density:

r_electron=6.26 gm/cc
note: r_Finnemanite=7.54 gm/cc.

Fermion Index

Fermion Index = 0.15902
Boson Index = 0.84098

Photoelectric:

PE_Finnemanite=1,342.06 barns/electron
U=PE_Finnemanite x r_electron=8,403.28 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Finnemanite is Not Radioactive

Finnemanite Classification

Dana Class:

46.1.1.1 (46)Basic or Halogen-Containing Antimonites, Arsenites and Phosphites

(46.1)where (A B)m (XO3)p Zq

(46.1.1)Dana Group

46.1.1.1 Finnemanite Pb5(AsO3)3Cl P 6₃ 6

Strunz Class:

IV/J.03-10 IV - Oxides

IV/J - Arsenides with [AsO3]3- groups

IV/J.03 - Finnemanite - Nealite series

IV/J.03-10 Finnemanite Pb5(AsO3)3Cl P 6₃ 6

IV/J.03-20 Freedite Pb8Cu(AsO3)2O3Cl5 C 2/m 2/m

IV/J.03-30 Trigonite Pb3Mn(AsO3)2(AsO2OH) Pn m

IV/J.03-40 Rouseite Pb2Mn(AsO3)2·2(H2O) P1,P 1 Tri

IV/J.03-50 Nealite Pb4Fe(AsO4)2Cl4 P1 1

Other Finnemanite Information

References:

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

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

Finnemanite

Pb5(As+++O3)3Cl
Dana No: 46.1.1.1 Strunz No: IV/J.03-10
Locality:

Notes: