Diaboleite Mineral Data

Diaboleite Mineral Data +

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General Diaboleite Information

Chemical Formula:

Pb2CuCl2(OH)4

Composition:

Molecular Weight = 616.88 gm

Copper 10.30 % Cu 11.60 % Cu₂O

Hydrogen 0.65 % H 5.84 % H₂O

Lead 67.18 % Pb 72.36 % PbO

Chlorine 11.49 % Cl 11.49 % Cl

- % Cl -2.59 % -O=Cl₂

Oxygen 10.37 % O

______ ______

100.00 % 98.70 % = TOTAL OXIDE

Empirical Formula:

2(Pb)2(OH)₂CuCl₂

IMA Status:

Valid Species (Pre-IMA) 1923

Locality:

Higher Pitts, Mendip Hills, Somersetshire, England. Link to MinDat.org Location Data.

Name Origin:

From the Greek dia, "difference" and the mineral Boleite.

Diaboleite Image

Images:

Diaboleite

Comments: Coarsely crystalline, blue diaboleite.
Location: Mammoth Mine, Tiger, Arizona. USA. Scale: 2.8 x 2.5 cm.
© John Veevaert

Images:

Diaboleite Yedlinite

Comments: Minute cranberry-colored rounded yedlinite crystal with blue diaboleite on yellow-brown wulfenite.
Location: Mammoth Mine, Tiger, Pinal County, Arizona, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Diaboleite Crystallography

Axial Ratios:

a:c = 1:0.93594

Cell Dimensions:

a = 5.87, c = 5.494, Z = 1; V = 189.31 Den(Calc)= 5.41

Crystal System:

Tetragonal - Ditetragonal PyramidalH-M Symbol (4mm) Space Group: P 4mm

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

By Intensity(I/I_o): 2.292(1), 3.314(1), 5.507(1),

Forms:

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Forms: [ 0 1 10] [ 1 1 1] [ 1 0 0] [ 0 0 1]

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Crystal Structure:

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Cooper M A , Hawthorne F C , The Canadian Mineralogist , 33 (1995) p.1125-1129, Diaboleite, Pb2Cu(OH)4Cl2, a defect perovskite structure with stereoactive, lone-pair behavior of Pb

Physical Properties of Diaboleite

Cleavage:

[001] Perfect

Color:

Dark blue, Bright sky blue.

Density:

5.48 - 6.41, Average = 5.94

Diaphaniety:

Transparent to Translucent

Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Habit:

Encrustations - Forms crust-like aggregates on matrix.

Habit:

Euhedral Crystals - Occurs as well-formed crystals showing good external form.

Habit:

Granular - Generally occurs as anhedral to subhedral crystals in matrix.

Hardness:

2.5 - Finger Nail

Luster:

Adamantine

Streak:

blue

Optical Properties of Diaboleite

Dichroism (e):

pale blue or pale bluish white.

Dichroism (w):

deep blue or deep blue.

Gladstone-Dale:

CI meas= 0.143 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.058 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1691,KPDmeas= 0.1539,KC= 0.1796

Optical Data:

Uniaxial (-), e=1.85, w=1.98, bire=0.1300.

Calculated Properties of Diaboleite

Electron Density:

r_electron=4.61 gm/cc
note: r_Diaboleite=5.41 gm/cc.

Fermion Index

Fermion Index = 0.14851
Boson Index = 0.85149

Photoelectric:

PE_Diaboleite=1,215.36 barns/electron
U=PE_Diaboleite x r_electron=5,606.43 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Diaboleite is Not Radioactive

Diaboleite Classification

Dana Class:

10.6.1.1 (10)Oxyhalides and Hydroxyhalides

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

(10.6.1)Dana Group

10.6.1.1 Diaboleite Pb2CuCl2(OH)4 P 4mm 4mm

Strunz Class:

III/D.12-50 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 Diaboleite Information

References:

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

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Diaboleite

Pb2CuCl2(OH)4
Dana No: 10.6.1.1 Strunz No: III/D.12-50
Locality:

Notes: