Pseudoboleite Mineral Data

Pseudoboleite Mineral Data +

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General Pseudoboleite Information

Chemical Formula:

Pb5Cu4Cl10(OH)8·2(H2O)

Composition:

Molecular Weight = 10962.72 gm

Copper 13.91 % Cu 17.41 % CuO

Hydrogen 0.44 % H 3.94 % H₂O

Lead 58.59 % Pb 63.12 % PbO

Chlorine 20.05 % Cl 20.05 % Cl

- % Cl -4.52 % -O=Cl₂

Oxygen 7.01 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Pb₃₁Cu₂₄Cl₆₂(OH)₄₈

Environment:

Sedimentary copper deposits.

IMA Status:

Valid Species (Pre-IMA) 1895

Locality:

Boleo, near Santa Rosalia, Baja California Sur, Mexico. Link to MinDat.org Location Data.

Name Origin:

Named after its similarity to the mineral Boleite.

Synonym:

ICSD 67680

PDF 22-470

Percylite

Pseudoboleite Image

Images:

Pseudoboleite

Comments: Blue crystal of pseudoboleite.
Location: Curuglu Mine, Santa Rosal?a (El Bole?), Bole? District, Mun. de Muleg?, Baja California Sur, Mexico. Scale: Crystal size 4.5 mm.
© Thomas Witzke / Abraxas-Verlag

Pseudoboleite Crystallography

Axial Ratios:

a:c = 1:2.01706

Cell Dimensions:

a = 15.24, c = 30.74, Z = 2; V = 7,139.60 Den(Calc)= 5.10

Crystal System:

Tetragonal - Ditetragonal DipyramidalH-M Symbol (4/m 2/m 2/m) Space Group: I 4/mmm

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

By Intensity(I/I_o): 3.83(1), 4.43(1), 2.71(0.95),

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

Giuseppetti G , Mazzi F , Tadini C , Neues Jahrbuch fur Mineralogie, Monatshefte , 1992 (1992) p.113-126

Physical Properties of Pseudoboleite

Cleavage:

[001] Perfect

Color:

Indigo blue.

Density:

Diaphaniety:

Transparent

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Habit:

Pseudo Cubic - Crystals show a cubic outline.

Hardness:

2.5 - Finger Nail

Luster:

Vitreous - Pearly

Streak:

light green

Optical Properties of Pseudoboleite

Gladstone-Dale:

CI meas= -0.067 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= -0.046 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.199,KPDmeas= 0.203,KC= 0.1903

Optical Data:

Uniaxial (-), e=2, w=2.03, bire=0.0300.

Calculated Properties of Pseudoboleite

Electron Density:

r_electron=4.40 gm/cc
note: r_{Pseudoboleite}=5.10 gm/cc.

Fermion Index

Fermion Index = 0.12952
Boson Index = 0.87048

Photoelectric:

PE_{Pseudoboleite}=1,051.91 barns/electron
U=PE_{Pseudoboleite} x r_electron=4,623.51 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Pseudoboleite is Not Radioactive

Pseudoboleite Classification

Dana Class:

10.6.8.1 (10)Oxyhalides and Hydroxyhalides

(10.6)where Am Bn (O,OH)p Xq

(10.6.8)Dana Group

10.6.8.1 Pseudoboleite Pb5Cu4Cl10(OH)8·2(H2O) I 4/mmm 4/m 2/m 2/m

Strunz Class:

III/D.12-20 III - Halogenides

III/D - Oxi-halogenides with Pb - Bi - Sb and related compounds

III/D.12 - Boleite - Yedlinite series

III/D.12-10 Boleite KPb26Ag9Cu24Cl62(OH)48 P m3m 4/m 3 2/m

III/D.12-20 Pseudoboleite Pb5Cu4Cl10(OH)8·2(H2O) I 4/mmm 4/m 2/m 2/m

III/D.12-40 Cumengite Pb21Cu20Cl42(OH)40 I 4/mmm 4/m 2/m 2/m

III/D.12-50 Diaboleite Pb2CuCl2(OH)4 P 4mm 4mm

III/D.12-60 Chloroxiphite Pb3CuCl2(OH)2O2 P 2₁/m 2/m

III/D.12-70 Hematophanite Pb4Fe3O8(OH,Cl) P 4mm 4mm

III/D.12-80 Bideauxite Pb2AgCl3(F,OH)2 F d3m 4/m 3 2/m

III/D.12-90 Yedlinite Pb6CrCl6(O,OH)8 R 3 3

Other Pseudoboleite Information

References:

NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)

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Pseudoboleite

Pb5Cu4Cl10(OH)8·2(H2O)
Dana No: 10.6.8.1 Strunz No: III/D.12-20
Locality:

Notes: