Feinglosite Mineral Data

Feinglosite Mineral Data +

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.

Synonym:

IMA1995-013

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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

Diaphaniety:

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:

r_electron=5.61 gm/cc
note: r_Feinglosite=6.50 gm/cc.

Fermion Index

Fermion Index = 0.12513
Boson Index = 0.87487

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Feinglosite is Not Radioactive

Feinglosite Classification

Dana Class:

40.2.8.3 (40)Hydrated Phosphates, etc

(40.2)where A++ (B++)2 (XO4) · x(H2O)

(40.2.8)Brackebushite Group

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

40.2.8.2 Arsenbrackebuschite Pb2(Fe,Zn)(AsO4)2·(H2O) P 2₁/m 2/m

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

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

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

Strunz Class:

VII/B.24-45 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.24 - Brackebuschite - Tsumebite group, Bearthite - Jamesite series

VII/B.24-05 Bearthite Ca2Al(PO4)2(OH) P 2₁/m 2/m

VII/B.24-10 Goedkenite (Sr,Ca)2Al(PO4)2(OH) P 2₁/m 2/m

VII/B.24-20 Gamagarite Ba2(Fe,Mn)(VO4)2(OH) P 2₁/m 2/m

VII/B.24-22 Tokyoite! Ba2Mn(VO4)2(OH) P 2₁/m 2/m

VII/B.24-25 Bushmakinite! Pb2Al(PO4)(VO4)(OH) P 2₁/m 2/m

VII/B.24-28 Calderonite! Pb2Fe(VO4)2(OH) P 2₁/m 2/m

VII/B.24-30 Brackebuschite Pb2(Mn,Fe)(VO4)2(OH) P 2₁/m 2/m

VII/B.24-40 Arsenbrackebuschite Pb2(Fe,Zn)(AsO4)2·(H2O) P 2₁/m 2/m

VII/B.24-45 Feinglosite Pb2(Zn,Fe)[(As,S)O4]2·(H2O) P 2₁,P 2₁/m Mono

VII/B.24-50 Tsumebite Pb2Cu(PO4)(SO4)(OH) P 2₁/m 2/m

VII/B.24-60 Arsentsumebite Pb2Cu(AsO4)(SO4)(OH) P 2₁/m 2/m

VII/B.24-65 Lulzacite! Sr2Fe(Fe,Mg)2Al4(PO4)4(OH)10 P1 1

VII/B.24-70 Jamesite Pb2Zn2Fe5(AsO4)5O4 P1 1

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 -Google Images 4 -Google Scholar 5 -Handbook of Mineralogy (UofA) 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas

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Feinglosite

Pb2(Zn,Fe)[(As,S)O4]2·(H2O)
Dana No: 40.2.8.3 Strunz No: VII/B.24-45
Locality:

Notes: