Corkite Mineral Data

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General Corkite Information

Chemical Formula:

PbFe+++3(PO4)(SO4)(OH)6

Composition:

Molecular Weight = 667.82 gm

Iron 25.09 % Fe 35.87 % Fe₂O₃

Phosphorus 4.64 % P 10.63 % P₂O₅

Hydrogen 0.91 % H 8.09 % H₂O

Lead 31.03 % Pb 33.42 % PbO

Sulfur 4.80 % S 11.99 % SO₃

Oxygen 33.54 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

PbFe³⁺₃(PO₄)(SO₄)(OH)₆

Environment:

Secondary mineral formed at low temperatures or by weathering in oxidized hydrothermal base-metal deposits.

IMA Status:

Valid Species (Pre-IMA) 1862

Locality:

Glandore iron mines, Co. Cork, Ireland. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Synonym:

ICSD 68352

PDF 17-471

Corkite Image

Images:

Corkite Hinsdalite

Comments: Small brown rounded translucent crystals of corkite on darker brown botryoidal hinsdalite.
Location: Grube Schone Aussicht, near Dernbach, Montabaur, Rheinland-Pflaz, Germany. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Corkite Crystallography

Axial Ratios:

a:c = 1:2.30747

Cell Dimensions:

a = 7.22, c = 16.66, Z = 3; V = 752.11 Den(Calc)= 4.42

Crystal System:

Trigonal - Ditrigonal PyramidalH-M Symbol (3m) Space Group: R 3m

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

By Intensity(I/I_o): 3.03(1), 5.86(0.65), 2.237(0.55),

Crystal Structure:

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Giuseppe G , Tadini C , Neues Jahrbuch fur Mineralogie, Monatshefte , 1987 (1987) p.71-81, Corkite, PbFe3(SO4)(PO4)(OH)6, its crystal structure and ordered, arrangement of the tetrahedral cations, Note: this is the prefered structure of these authors, Locality: Dernbach, Hessen-Nassau, Germany

Physical Properties of Corkite

Cleavage:

{0001} Perfect

Color:

Brownish yellow, Yellow green, Light yellow, Dark green.

Density:

4.295

Diaphaneity:

Transparent to Translucent

Hardness:

3.5-4.5 - Between Copper Penny and Fluorite-Apatite

Luster:

Vitreous - Resinous

Optical Properties of Corkite

Gladstone-Dale:

CI meas= 0.04 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.067 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2104,KPDmeas= 0.2165,KC= 0.2256
Ncalc = 1.97 - 2

Optical Data:

Uniaxial (-), e=1.93, w=1.93, bire=0.0000.

Calculated Properties of Corkite

Electron Density:

Bulk Density (Electron Density)=3.97 gm/cc
note: Specific Gravity of Corkite =4.30 gm/cc.

Fermion Index:

Fermion Index = 0.07
Boson Index = 0.93

Photoelectric:

PE_Corkite= 523.15 barns/electron
U=PE_Corkite x rElectron Density=2,079.30 barns/cc.

Radioactivity:

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

Corkite Classification

Dana Class:

43.04.01.02 (43)Compound Phosphates, etc.

(43.04)(Anhydrous Compound Anions With Hydroxyl or Halogen)

(43.04.01)Beudantite Group

43.04.01.01 Beudantite PbFe3(AsO4)(SO4)(OH)6 R 3m 3 2/m

43.04.01.02 Corkite PbFe3(PO4)(SO4)(OH)6 R 3m 3m

43.04.01.03 Hidalgoite PbAl3(AsO4)(SO4)(OH)6 R 3m 3 2/m

43.04.01.04 Orpheite PbAl3(PO4,SO4)2(OH)6(?) R 3m 3 2/m

43.04.01.05 Hinsdalite (Pb,Sr)Al3(PO4)(SO4)(OH)6 R 3m 3 2/m

43.04.01.06 Svanbergite SrAl3(PO4)(SO4)(OH)6 R 3m 3 2/m

43.04.01.07 Kemmlitzite (Sr,Ce)Al3(AsO4)(SO4)(OH)6 R 3m 3 2/m

43.04.01.08 Woodhouseite CaAl3(PO4)(SO4)(OH)6 R 3m 3 2/m

43.04.01.09 Weilerite BaAl3H[(As,P)O4]2(OH)6 R 3m 3 2/m

43.04.01.10 Gallobeudantite! PbGa3[(AsO4),(SO4)]2(OH)6 R 3m 3m

Strunz Class:

08.BL.05 08 - PHOSPHATES, ARSENATES, VANADATES

08.B - Phosphates, etc. with Additional Anions, without H2O

08.BL -With medium-sized and large cations, (OH, etc.):RO4 = 3:1

08.BL.05 Beudantite PbFe3(AsO4)(SO4)(OH)6 R 3m 3 2/m

08.BL.05 Corkite PbFe3(PO4)(SO4)(OH)6 R 3m 3m

08.BL.05 Hidalgoite PbAl3(AsO4)(SO4)(OH)6 R 3m 3 2/m

08.BL.05 Gallobeudantite! PbGa3[(AsO4),(SO4)]2(OH)6 R 3m 3m

08.BL.05 Hinsdalite (Pb,Sr)Al3(PO4)(SO4)(OH)6 R 3m 3 2/m

08.BL.05 Kemmlitzite (Sr,Ce)Al3(AsO4)(SO4)(OH)6 R 3m 3 2/m

08.BL.05 Orpheite PbAl3(PO4,SO4)2(OH)6(?) R 3m 3 2/m

08.BL.05 Woodhouseite CaAl3(PO4)(SO4)(OH)6 R 3m 3 2/m

08.BL.05 Weilerite BaAl3H[(As,P)O4]2(OH)6 R 3m 3 2/m

08.BL.05 Svanbergite SrAl3(PO4)(SO4)(OH)6 R 3m 3 2/m

Other Corkite Information

References:

NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

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

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

Corkite

PbFe+++3(PO4)(SO4)(OH)6
Dana No: 43.04.01.02 Strunz No: 08.BL.05
Locality:

Notes: