Duhamelite Mineral Data

General Duhamelite Information

Chemical Formula:

Pb2Cu4Bi(VO4)4(OH)3•8(H2O)

Composition:

Molecular Weight = 1,532.47 gm

Vanadium 13.30 % V 23.74 % V₂O₅

Copper 16.59 % Cu 18.67 % Cu₂O

Bismuth 13.64 % Bi 15.20 % Bi₂O₃

Hydrogen 1.25 % H 11.17 % H₂O

Lead 27.04 % Pb 29.13 % PbO

Oxygen 28.19 % O

______ ______

100.00 % 97.91 % = TOTAL OXIDE

Empirical Formula:

Pb₂Cu₄Bi(VO₄)₄(OH)₃•8(H₂O)

Environment:

Au-bearing quartz veins cutting Precambrian greenstones. Approved in 1981. Discredited as being a Bi, Ca-bearing mottramite (IMA Code 01-B) in 2001.

IMA Status:

Discredited IMA 2001 - Approved IMA 1981

Locality:

5 km SW of Payson, at Lousy Gulch, Gila County, Arizona, USA. Link to MinDat.org Location Data.

Name Origin:

Named in 1981 for J. E. DuHamel, geologist, Phelps Dodge Corp., who found the mineral.

Name Pronunciation:

Duhamelite + Pronunciation

Synonym:

Discredited IMA 2001

IMA2001-B

Duhamelite Crystallography

Axial Ratios:

a:b:c =0.7753:1:0.6076

Cell Dimensions:

a = 7.49, b = 9.66, c = 5.87, Z = 1; V = 424.71 Den(Calc)= 5.99

Crystal System:

Orthorhombic Space Group: Unk

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

By Intensity(I/I_o): 2.95(1), 2.642(0.9), 3.159(0.7),

Physical Properties of Duhamelite

Color:

Greenish yellow, Olive green.

Density:

5.8

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Hardness:

3 - Calcite

Streak:

yellow green

Optical Properties of Duhamelite

Gladstone-Dale:

CI meas= 0.159 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.185 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1828,KPDmeas= 0.1888,KC= 0.2244
Ncalc = 2.3 - 2.34

Optical Data:

Biaxial (?), a=2.08, b=2.11,

Pleochroism (x):

weak yellow.

Pleochroism (y):

weaker yellow.

Pleochroism (z):

weaker yellow.

Calculated Properties of Duhamelite

Electron Density:

Bulk Density (Electron Density)=5.22 gm/cc
note: Specific Gravity of Duhamelite =5.80 gm/cc.

Fermion Index:

Fermion Index = 0.06
Boson Index = 0.94

Photoelectric:

PE_Duhamelite= 715.19 barns/electron
U=PE_Duhamelite x rElectron Density=3,735.40 barns/cc.

Radioactivity:

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

Duhamelite Classification

Dana Class:

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

(42.09)where (A)3 (XO4)2 Zq ï¿½ x(H2O)

(42.09.05)Dana Group

42.09.05.01 Duhamelite? Pb2Cu4Bi(VO4)4(OH)3•8(H2O) Unk Ortho

Strunz Class:

08.BH.40 08 - PHOSPHATES, ARSENATES, VANADATES

08.B - Phosphates, etc. with Additional Anions, without H2O

08.BH -With medium-sized and large cations, (OH,etc.):RO4 = 1:1

08.BH.40 Descloizite PbZn(VO4)(OH) Pnam 2/m 2/m 2/m

08.BH.40 Cechite Pb(Fe,Mn)(VO4)(OH) Pnam 2/m 2/m 2/m

08.BH.40 Duhamelite? Pb2Cu4Bi(VO4)4(OH)3•8(H2O) Unk Ortho

08.BH.40 Pyrobelonite PbMn(VO4)(OH) Pnam 2/m 2/m 2/m

08.BH.40 Mottramite PbCu(VO4)(OH) Pnam 2/m 2/m 2/m

Other Duhamelite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Duhamelite :
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 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

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

Duhamelite

Pb2Cu4Bi(VO4)4(OH)3•8(H2O)
Dana No: 42.09.05.01 Strunz No: 08.BH.40
Locality:

Notes:

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