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.

Name Pronunciation:

Finnemanite + Pronunciation

Synonym:

ICSD 100168

PDF 14-1887

Finnemanite Image

Images:

Finnemanite

Comments: Black, prismatic, twinned crystal of finnemanite.
Location: Långban, Filipstad, Värmland, 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),

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Forms: ( 1 0 1) ( 0 1 0) ( 0 0 1)

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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

Diaphaneity:

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
Ncalc = 2.16 - 2.2

Optical Data:

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

Calculated Properties of Finnemanite

Electron Density:

Bulk Density (Electron Density)=6.26 gm/cc
note: Specific Gravity of Finnemanite =7.54 gm/cc.

Fermion Index:

Fermion Index = 0.15
Boson Index = 0.85

Photoelectric:

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

Radioactivity:

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

Finnemanite Classification

Dana Class:

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

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

(46.01.01)Dana Group

46.01.01.01 Finnemanite Pb5(AsO3)3Cl P 6₃ 6

Strunz Class:

04.JB.45 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate

04.J - Arsenites, Antimonites, Bismuthites, Sulfites,

04.JB -Arsenites, antimonites, bismuthites; with additional anions, without H2O

04.JB.45 Finnemanite Pb5(AsO3)3Cl P 6₃ 6

Other Finnemanite Information

References:

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

See Also:

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

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

Finnemanite

Pb5(As+++O3)3Cl
Dana No: 46.01.01.01 Strunz No: 04.JB.45
Locality:

Notes: