Feinglosite Mineral Data

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General Feinglosite Information

Chemical Formula:

Pb2(Zn,Fe)[(As,S)O4]2•(H2O)

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

Empirical Formula:

Pb₂Zn_0.75Fe²⁺_0.25(AsO₄)_1.5(SO₄)_0.5•(H₂O)

Environment:

The Zn-dominant analogue of arsenbrackebuschite.

IMA Status:

Approved IMA 1995 (Dana # Added)

Locality:

Tsumeb mine, Tsumeb, Namibia. Link to MinDat.org Location Data.

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.

Name Pronunciation:

Feinglosite + Pronunciation

Synonym:

IMA1995-013

Feinglosite Image

Images:

Feinglosite

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

Axial Ratios:

a:b:c =1.5068:1:1.3041

Cell Dimensions:

a = 8.973, b = 5.955, c = 7.766, Z = 2; beta = 112.2° V = 384.21 Den(Calc)= 6.50

Crystal System:

MonoclinicSpace Group: P 2₁,P 2₁/m

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

By Intensity(I/I_o): 3.246(1), 2.769(0.6), 2.988(0.6),

Physical Properties of Feinglosite

Color:

Pale olive green.

Density:

6.52

Diaphaneity:

Transparent

Hardness:

4-5 - Fluorite-Apatite

Luster:

Adamantine

Streak:

white

Optical Properties of Feinglosite

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

RL Bireflectance:

Very weak.

RL Color:

Very pale brownish gray.

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**
Relative Intensity	0%	90%	100%	180%	270%	360%	450%	540%	630%	720%	810%
R₁
R₂

Calculated Properties of Feinglosite

Electron Density:

Bulk Density (Electron Density)=5.61 gm/cc
note: Specific Gravity of Feinglosite =6.50 gm/cc.

Fermion Index:

Fermion Index = 0.12
Boson Index = 0.88

Photoelectric:

PE_Feinglosite= 995.79 barns/electron
U=PE_Feinglosite x rElectron Density=5,587.34 barns/cc.

Radioactivity:

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

Feinglosite Classification

Dana Class:

40.02.08.03 (40)Hydrated Phosphates, etc

(40.02)where A++ (B++)2 (XO4) · x(H2O)

(40.02.08)Brackebushite Group

40.02.08.01 Brackebuschite Pb2(Mn,Fe)(VO4)2(OH) P 2₁/m 2/m

40.02.08.02 Arsenbrackebuschite Pb2(Fe,Zn)(AsO4)2•(H2O) P 2₁/m 2/m

40.02.08.03 Feinglosite! Pb2(Zn,Fe)[(As,S)O4]2•(H2O) P 2₁,P 2₁/m Mono

40.02.08.04 Calderonite! Pb2Fe(VO4)2(OH) P 2₁/m 2/m

40.02.08.05 Bushmakinite! Pb2Al(PO4)(VO4)(OH) P 2₁/m 2/m

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

References:

NAME( CanMin, 8/99) PHYS. PROP.(Eur. J. Min.,Vol.8,1996) OPTIC PROP.(AntBidBlaNic4)

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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Feinglosite

Pb2(Zn,Fe)[(As,S)O4]2•(H2O)
Dana No: 40.02.08.03 Strunz No: 08.BG.05
Locality:

Notes: