Corkite Mineral Data

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

IMA Status:

Valid Species (Pre-IMA) 1862

Locality:

Link to MinDat.org Location Data.

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:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

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

Diaphaniety:

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

Optical Data:

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

Calculated Properties of Corkite

Electron Density:

r_electron=3.97 gm/cc
note: r_Corkite=4.30 gm/cc.

Fermion Index

Fermion Index = 0.0744
Boson Index = 0.9256

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Corkite is Not Radioactive

Corkite Classification

Dana Class:

43.4.1.2 (43)Compound Phosphates, etc.

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

(43.4.1)Dana Group

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

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

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

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

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

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

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

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

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

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

Strunz Class:

VII/B.35-80 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.35 - Beudantite group

VII/B.35-10 Schlossmacherite (H3O,Ca)Al3(AsO4,SO4)2(OH)6 R 3m 3 2/m

VII/B.35-20 Woodhouseite CaAl3(PO4)(SO4)(OH)6 R 3m 3 2/m

VII/B.35-30 Svanbergite SrAl3(PO4)(SO4)(OH)6 R 3m 3 2/m

VII/B.35-40 Kemmlitzite (Sr,Ce)Al3(AsO4)(SO4)(OH)6 R 3m 3 2/m

VII/B.35-60 Hinsdalite (Pb,Sr)Al3(PO4)(SO4)(OH)6 R 3m 3 2/m

VII/B.35-65 Orpheite PbAl3(PO4,SO4)2(OH)6(?) R 3m 3 2/m

VII/B.35-70 Hidalgoite PbAl3(AsO4)(SO4)(OH)6 R 3m 3 2/m

VII/B.35-75 Gallobeudantite! PbGa3[(AsO4),(SO4)]2(OH)6 R 3m 3m

VII/B.35-80 Corkite PbFe3(PO4)(SO4)(OH)6 R 3m 3m

VII/B.35-90 Beudantite PbFe3(AsO4)(SO4)(OH)6 R 3m 3 2/m

Other Corkite 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 Corkite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - Crocoite.com Mineral Locations 4 - EUROmin Project 5 -Google Images 6 -Google Scholar 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

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

Corkite

PbFe+++3(PO4)(SO4)(OH)6
Dana No: 43.4.1.2 Strunz No: VII/B.35-80
Locality:

Notes: