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Feinglosite Mineral Data

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General Feinglosite Information

Help on Chemical  Formula: Chemical Formula: Pb2(Zn,Fe)[(As,S)O4]2•(H2O)
Help on Composition: Composition: Molecular Weight = 751.83 gm
   Zinc       6.52 %  Zn    8.12 % ZnO
   Iron       1.86 %  Fe    2.39 % FeO
   Arsenic   14.95 %  As   22.93 % As2O5
   Hydrogen   0.27 %  H     2.40 % H2O
   Lead      55.12 %  Pb   59.37 % PbO
   Sulfur     2.13 %  S     5.32 % SO3
   Oxygen    19.15 %  O
            ______        ______ 
            100.00 %      100.53 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Pb2Zn0.75Fe2+0.25(AsO4)1.5(SO4)0.5•(H2O)
Help on Environment: Environment: The Zn-dominant analogue of arsenbrackebuschite.
Help on IMA Status: IMA Status: Approved IMA 1995 (Dana # Added)
Help on Locality: Locality: Tsumeb mine, Tsumeb, Namibia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after Mark N. Feinglos (b. 1948), Professor at the Duke University Medical Center, Durham, North Carolina, U.S.A., who discovered the mineral.
Help on Name Pronunciation: Name Pronunciation: Feinglosite + Pronunciation Say FEINGLOSITE
Help on Synonym: Synonym: IMA1995-013

Feinglosite Image

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Comments: Feinglositc in polished section: (a) PPL light and (b) XPL light. In (a) note the inclusions of goethite (white) in the grey feinglosite (the black areas are holes). In (b) note the white to gray clusters of feinglosite. Black areas are goethite.
Location: Lining a cavity in a sample of massive chalcocite from Tsumeb, Namibia. (MinMag, v61:405). Scale: Picture Width 1 mm.
© Mineralogical Magazine

Feinglosite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.5068:1:1.3041
Help on Cell Dimensions: Cell Dimensions: a = 8.973, b = 5.955, c = 7.766, Z = 2; beta = 112.2° V = 384.21 Den(Calc)= 6.50
Help on Crystal System: Crystal System: Monoclinic Space Group: P 21,P 21/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.246(1), 2.769(0.6), 2.988(0.6),

Physical Properties of Feinglosite

Help on Color: Color: Pale olive green.
Help on Density: Density: 6.52
Help on Diaphaneity: Diaphaneity: Transparent
Help on Hardness: Hardness: 4-5 - Fluorite-Apatite
Help on Luster: Luster: Adamantine
Help on Streak: Streak: white

Optical Properties of Feinglosite

Help on Optical Data: Optical Data: Biaxial (?)
  NCalc= 1.98 - from Gladstone-Dale relationship (KC = 0.151) where Ncalc=Dcalc*KC+1
NCalc= 1.98 - from Gladstone-Dale relationship (KC = 0.151) where Ncalc=Dmeas*KC+1
Help on RL Bireflectance: RL Bireflectance: Very weak.
Help on RL Color: RL Color: Very pale brownish gray.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Feinglosite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 400 nm   12.20   12.30 
 420 nm   11.80   12.00 
 440 nm   11.60   11.80 
 460 nm   11.40   11.60 
 480 nm   11.20   11.40 
 500 nm   11.10   11.20 
 520 nm   10.90   11.10 
 540 nm   10.80   11.00 
 560 nm   10.80   10.90 
 580 nm   10.70   10.80 
 600 nm   10.70   10.80 
 620 nm   10.70   10.80 
 640 nm   10.70   10.80 
 660 nm   10.70   10.80 
 680 nm   10.70   10.80 
 700 nm   10.60   10.70 
Calculated Relative Intensity Colors of Feinglosite in Air
   0%   90% 100% 180% 270% 360% 450% 540% 630% 720% 810%

Calculated Properties of Feinglosite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=5.61 gm/cc
note: Specific Gravity of Feinglosite =6.50 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.12
Boson Index = 0.88
Help on Photoelectric: Photoelectric: PEFeinglosite = 995.79 barns/electron
U=PEFeinglosite x rElectron Density=5,587.34 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Feinglosite is Not Radioactive

Feinglosite Classification

Help on  Dana Class: Dana Class: (40)Hydrated Phosphates, etc
  (40.02)where A++ (B++)2 (XO4) � x(H2O)
  (40.02.08)Brackebushite Group Brackebuschite Pb2(Mn,Fe)(VO4)2(OH) P 21/m 2/m Arsenbrackebuschite Pb2(Fe,Zn)(AsO4)2•(H2O) P 21/m 2/m Feinglosite! Pb2(Zn,Fe)[(As,S)O4]2•(H2O) P 21,P 21/m Mono Calderonite! Pb2Fe(VO4)2(OH) P 21/m 2/m Bushmakinite! Pb2Al(PO4)(VO4)(OH) P 21/m 2/m
Help on  Strunz Class: Strunz Class: 08.BG.05 08 - PHOSPHATES, ARSENATES, VANADATES
  08.B - Phosphates, etc. with Additional Anions, without H2O
  08.BG -With medium-sized and large cations, (OH, etc.):RO4 = 0.5:1
08.BG.05 Arsenbrackebuschite Pb2(Fe,Zn)(AsO4)2•(H2O) P 21/m 2/m
08.BG.05 Bearthite Ca2Al(PO4)2(OH) P 21/m 2/m
08.BG.05 Arsentsumebite Pb2Cu(AsO4)(SO4)(OH) P 21/m 2/m
08.BG.05 Brackebuschite Pb2(Mn,Fe)(VO4)2(OH) P 21/m 2/m
08.BG.05 Feinglosite! Pb2(Zn,Fe)[(As,S)O4]2•(H2O) P 21,P 21/m Mono
08.BG.05 Gamagarite Ba2(Fe,Mn)(VO4)2(OH) P 21/m 2/m
08.BG.05 Goedkenite (Sr,Ca)2Al(PO4)2(OH) P 21/m 2/m
08.BG.05 Tsumebite Pb2Cu(PO4)(SO4)(OH) P 21/m 2/m
08.BG.05 Calderonite! Pb2Fe(VO4)2(OH) P 21/m 2/m
08.BG.05 Bushmakinite! Pb2Al(PO4)(VO4)(OH) P 21/m 2/m
08.BG.05 Tokyoite! Ba2Mn(VO4)2(OH) P 21/m 2/m

Other Feinglosite Information

Help on References: References: NAME( CanMin, 8/99) PHYS. PROP.(Eur. J. Min.,Vol.8,1996) OPTIC PROP.(AntBidBlaNic4)
Help on See Also: See Also: Links to other databases for Feinglosite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (MinSocAm)
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

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Dana No: Strunz No: 08.BG.05





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