Plumbogummite Mineral Data

Plumbogummite Mineral Data +

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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."

Synonym:

Hitchcockite

ICSD 87868

PDF 35-623

Schadeite

Plumbogummite Image

Images:

Click Here for Larger Plumbogummite Image

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 ScalenohedralH-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),

Crystal Structure:

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Kolitsch U , Tiekink E R T , Slade P G , Taylor M R , Pring A , European Journal of Mineralogy , 11 (1999) p.513-520, Hinsdalite and plumbogummite, their atomic arrangements, and disordered lead sites

Physical Properties of Plumbogummite

Cleavage:

None

Color:

White, Gray, Yellow, Bluish green, Brown.

Density:

4 - 5, Average = 4.5

Diaphaniety:

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:

None.

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

Optical Data:

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

Calculated Properties of Plumbogummite

Electron Density:

r_electron=3.75 gm/cc
note: r_{Plumbogummite}=4.04 gm/cc.

Fermion Index

Fermion Index = 0.07898
Boson Index = 0.92102

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Plumbogummite is Not Radioactive

Plumbogummite Classification

Dana Class:

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

(42.7)where (AB)5 (XO4)3 Zq · x(H2O)

(42.7.3)Dana Group

42.7.3.1 Crandallite CaAl3(PO4)2(OH)5·(H2O) R 3m 3 2/m

42.7.3.2 Gorceixite BaAl3(PO4)(PO3OH)(OH)6 Cm m

42.7.3.3 Goyazite SrAl3(PO4)2(OH)5·(H2O) R 3m 3 2/m

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

42.7.3.5 Plumbogummite PbAl3(PO4)2(OH)5·(H2O) R 3m 3 2/m

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

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

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

Strunz Class:

VII/B.36-70 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.36 - Crandallite group

VII/B.36-10 Crandallite CaAl3(PO4)2(OH)5·(H2O) R 3m 3 2/m

VII/B.36-20 Arsenocrandallite (Ca,Sr)Al3[(As,P)O4]2(OH)5·(H2O) R 3m 3m

VII/B.36-30 Goyazite SrAl3(PO4)2(OH)5·(H2O) R 3m 3 2/m

VII/B.36-40 Arsenogoyazite (Sr,Ca,Ba)Al3(AsO4,PO4)2(OH,F)5·(H2O) R 3m 3 2/m

VII/B.36-50 Gorceixite BaAl3(PO4)(PO3OH)(OH)6 Cm m

VII/B.36-60 Arsenogorceixite! BaAl3AsO3(OH)(AsO4,PO4)(OH,F)6 R 3m 3 2/m

VII/B.36-70 Plumbogummite PbAl3(PO4)2(OH)5·(H2O) R 3m 3 2/m

VII/B.36-80 Philipsbornite PbAl3(AsO4)2(OH)5·(H2O) R 3m-,R 3m Trig

VII/B.36-90 Waylandite BiAl3(PO4)2(OH)6 R 3m 3 2/m

VII/B.36-100 Eylettersite (Th,Pb)1-xAl3(PO4,SiO4)2(OH)6(?) R 3m 3 2/m

VII/B.36-110 Florencite-(Ce) CeAl3(PO4)2(OH)6 R 3m 3 2/m

VII/B.36-120 Arsenoflorencite-(Ce) (Ce,La)Al3(AsO4)2(OH)6 R 3m 3 2/m

VII/B.36-125 Arsenoflorencite-(La)* (La,Sr)Al3(AsO4,SO4,PO4)2(OH)6 R 3m 3m

VII/B.36-130 Florencite-(La) (La,Ce)Al3(PO4)2(OH)6 R 3m 3 2/m

VII/B.36-135 Arsenoflorencite-(Nd)* (Nd,La,Ce,Ba)(Al,Fe)3(AsO4,PO4)2(OH)6 R 3m 3m

VII/B.36-140 Florencite-(Nd) (Nd,Ce)Al3(PO4)2(OH)6 R 3m 3 2/m

VII/B.36-150 Benauite! HSrFe3(PO4)2(OH)6 R 3m 3 2/m

VII/B.36-150* Lusungite? (Sr,Pb)Fe3(PO4)2(OH)5·(H2O) R 3m 3m

VII/B.36-152 Graulichite-(Ce)! CeFe3(AsO4)2(OH)6 R 3m 3 2/m

VII/B.36-155 Springcreekite! BaV3(PO4)2(OH,H2O)6 R 3m 3 2/m

VII/B.36-160 Dussertite BaFe3(AsO4)2(OH)5 R 3m 3m

VII/B.36-170 Zairite Bi(Fe,Al)3(PO4)2(OH)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 - Crocoite.com Mineral Locations 4 - EUROmin Project 5 -Google Images 6 -Google Scholar 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 -École des Mines de Paris

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Plumbogummite

PbAl3(PO4)2(OH)5·(H2O)
Dana No: 42.7.3.5 Strunz No: VII/B.36-70
Locality:

Notes: