Plumbogummite Mineral Data

General Plumbogummite Information

Chemical Formula:

PbAl3(PO4)2(OH)5•(H2O)

Composition:

Molecular Weight = 581.14 gm

Aluminum 13.93 % Al 26.32 % Al₂O₃

Phosphorus 10.66 % P 24.43 % P₂O₅

Hydrogen 1.21 % H 10.85 % H₂O

Lead 35.65 % Pb 38.41 % PbO

Oxygen 38.54 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

PbAl₃(PO₄)₂(OH)₅•(H₂O)

IMA Status:

Valid Species (Pre-IMA) 1832

Locality:

Link to MinDat.org Location Data.

Name Origin:

Named after its composition: plumbum - "lead" and gummi - "indian rubber."

Name Pronunciation:

Plumbogummite + Pronunciation

Synonym:

Hitchcockite

ICSD 87868

PDF 35-623

Schadeite

Plumbogummite Image

Images:

Plumbogummite Mimetite

Comments: White, fuzzy aggregates of plumbogummite covering lime green mimetite (campylite) crystals.
Location: Caldbeck Fells, Cumbria, England. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Plumbogummite Crystallography

Axial Ratios:

a:c = 1:2.39156

Cell Dimensions:

a = 7.018, c = 16.784, Z = 3; V = 715.90 Den(Calc)= 4.04

Crystal System:

Trigonal - Hexagonal Scalenohedral H-M Symbol (3 2/m) Space Group: R 3m

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

By Intensity(I/I_o): 2.97(1), 5.73(0.8), 3.51(0.6),

Physical Properties of Plumbogummite

Cleavage:

None

Color:

White, Gray, Yellow, Bluish green, Brown.

Density:

4 - 5, Average = 4.5

Diaphaneity:

Translucent

Fracture:

Conchoidal - Uneven - Uneven fracture producing small, conchoidal fragments.

Habit:

Colloform - Forming from a gel or colloidal mass.

Habit:

Stalactitic - Shaped like pendant columns as stalactites or stalagmites (e.g. calcite).

Hardness:

4-5 - Fluorite-Apatite

Luminescence:

Non-fluorescent.

Luster:

Greasy (Oily)

Streak:

white

Optical Properties of Plumbogummite

Dichroism (e):

Gladstone-Dale:

CI meas= 0.212 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.122 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1644,KPDmeas= 0.1476,KC= 0.1871
Ncalc = 1.75 - 1.94

Optical Data:

Uniaxial (+), w=1.653, e=1.675, bire=0.0220.

Calculated Properties of Plumbogummite

Electron Density:

Bulk Density (Electron Density)=3.75 gm/cc
note: Specific Gravity of Plumbogummite =4.04 gm/cc.

Fermion Index:

Fermion Index = 0.07
Boson Index = 0.93

Photoelectric:

PE_{Plumbogummite}= 590.04 barns/electron
U=PE_{Plumbogummite} x rElectron Density=2,215.00 barns/cc.

Radioactivity:

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

Plumbogummite Classification

Dana Class:

42.07.03.05 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen

(42.07)where (AB)5 (XO4)3 Zq � x(H2O)

(42.07.03)Crandallite Group

42.07.03.01 Crandallite CaAl3(PO4)2(OH)5•(H2O) R 3m 3 2/m

42.07.03.02 Gorceixite BaAl3(PO4)(PO3OH)(OH)6 R 3m 3 2/m

42.07.03.03 Goyazite SrAl3(PO4)2(OH)5•(H2O) R 3m 3 2/m

42.07.03.04 Lusungite? (Sr,Pb)Fe3(PO4)2(OH)5•(H2O) R 3m 3m

42.07.03.05 Plumbogummite PbAl3(PO4)2(OH)5•(H2O) R 3m 3 2/m

42.07.03.06 Kintoreite PbFe3(PO4)2(OH,H2O)6 R 3m 3 2/m

42.07.03.07 Benauite! HSrFe3(PO4)2(OH)6 R 3m 3 2/m

42.07.03.08 Springcreekite! BaV3(PO4)2(OH,H2O)6 R 3m 3 2/m

Strunz Class:

08.BL.10 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.10 Arsenogorceixite! BaAl3AsO3(OH)(AsO4,PO4)(OH,F)6 R 3m 3 2/m

08.BL.10 Arsenocrandallite (Ca,Sr)Al3[(As,P)O4]2(OH)5•(H2O) R 3m 3m

08.BL.10 Ferrazite? (Pb,Ba)3(PO4)2•8(H2O)(?) Tri

08.BL.10 Arsenowaylandite* BiAl3(AsO4)2(OH)6 R 3m 3 2/m

08.BL.10 Benauite! HSrFe3(PO4)2(OH)6 R 3m 3 2/m

08.BL.10 Arsenogoyazite (Sr,Ca,Ba)Al3(AsO4,PO4)2(OH,F)5•(H2O) R 3m 3 2/m

08.BL.10 Dussertite BaFe3(AsO4)2(OH)5 R 3m 3m

08.BL.10 Crandallite CaAl3(PO4)2(OH)5•(H2O) R 3m 3 2/m

08.BL.10 Goyazite SrAl3(PO4)2(OH)5•(H2O) R 3m 3 2/m

08.BL.10 Gorceixite BaAl3(PO4)(PO3OH)(OH)6 R 3m 3 2/m

08.BL.10 Kintoreite PbFe3(PO4)2(OH,H2O)6 R 3m 3 2/m

08.BL.10 Lusungite? (Sr,Pb)Fe3(PO4)2(OH)5•(H2O) R 3m 3m

08.BL.10 Philipsbornite PbAl3(AsO4)2(OH)5•(H2O) R 3m-,R 3m Trig

08.BL.10 Plumbogummite PbAl3(PO4)2(OH)5•(H2O) R 3m 3 2/m

08.BL.10 Segnitite PbFe3H(AsO4)2(OH)6 R 3m 3 2/m

08.BL.10 Springcreekite! BaV3(PO4)2(OH,H2O)6 R 3m 3 2/m

Other Plumbogummite Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Plumbogummite :
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 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Plumbogummite

PbAl3(PO4)2(OH)5•(H2O)
Dana No: 42.07.03.05 Strunz No: 08.BL.10
Locality:

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