Mottramite Mineral Data

General Mottramite Information

Chemical Formula:

PbCu(VO4)(OH)

Composition:

Molecular Weight = 402.69 gm

Vanadium 12.65 % V 22.58 % V₂O₅

Copper 15.78 % Cu 19.75 % CuO

Hydrogen 0.25 % H 2.24 % H₂O

Lead 51.45 % Pb 55.43 % PbO

Oxygen 19.87 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

PbCu(VO₄)(OH)

IMA Status:

Valid Species (Pre-IMA) 1876

Locality:

Mottram, St. Andrews, Cheshire, England. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Name Pronunciation:

Mottramite + Pronunciation

Synonym:

Cuprodescloizite

Duhamelite

ICSD 72457

IMA2001-B

PDF 43-1463

Mottramite Image

Images:

Mottramite Beaverite

Comments: Specimen of quartz with a thick druse of green mottramite (cuprodescloizite) crystals and a scattered grouping of micro beaverite crystals (lemon yellow in color).
Location: Tsumeb Mine, Tsumeb, Namibia. Scale: 3.3 x 2.5 cm.
© John Veevaert

Images:

Mottramite

Comments: Botryoidal green mottramite on white calcite.
Location: Tsumeb Mine,Tsumeb, Namibia. Scale: 7.5 cm by 8 cm.
© Kevin Ward

Mottramite Crystallography

Axial Ratios:

a:b:c =0.8262:1:0.6472

Cell Dimensions:

a = 7.685, b = 9.301, c = 6.02, Z = 4; V = 430.30 Den(Calc)= 6.22

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pnam

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

By Intensity(I/I_o): 3.24(1), 2.87(0.8), 5.07(0.8),

Physical Properties of Mottramite

Cleavage:

None

Color:

Brown, Brown red, Brownish black, Green, Dark green.

Density:

5.9 - 6, Average = 5.95

Diaphaneity:

Transparent to Opaque

Fracture:

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

Habit:

Encrustations - Forms crust-like aggregates on matrix.

Habit:

Plumose - "Mica-like" minerals forming aggregates of plume-like forms.

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Hardness:

3.5 - Copper Penny

Luster:

Greasy (Oily)

Streak:

light brownish green

Optical Properties of Mottramite

Gladstone-Dale:

CI meas= -0.125 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.076 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2063,KPDmeas= 0.2157,KC= 0.1917
Ncalc = 2.13 - 2.19

Optical Data:

Biaxial (-), a=2.21, b=2.31, g=2.33, bire=0.1200, 2V(Calc)=46, 2V(Meas)=73.

Calculated Properties of Mottramite

Electron Density:

Bulk Density (Electron Density)=5.41 gm/cc
note: Specific Gravity of Mottramite =6.22 gm/cc.

Fermion Index:

Fermion Index = 0.11
Boson Index = 0.89

Photoelectric:

PE_Mottramite= 919.10 barns/electron
U=PE_Mottramite x rElectron Density=4,968.74 barns/cc.

Radioactivity:

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

Mottramite Classification

Dana Class:

41.05.02.02 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen

(41.05)where (A B)2 (XO4) Zq

(41.05.02)Descloizite Group

41.05.02.01 Descloizite PbZn(VO4)(OH) Pnam 2/m 2/m 2/m

41.05.02.02 Mottramite PbCu(VO4)(OH) Pnam 2/m 2/m 2/m

41.05.02.03 Pyrobelonite PbMn(VO4)(OH) Pnam 2/m 2/m 2/m

41.05.02.04 Cechite Pb(Fe,Mn)(VO4)(OH) Pnam 2/m 2/m 2/m

41.05.02.05 Duftite-alpha PbCu(AsO4)(OH) P 2₁2₁2₁ 2 2 2

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 Mottramite Information

References:

NAME( Sinkankas66) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Sinkankas66)

See Also:

Links to other databases for Mottramite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - GeoScienceWorld
7 - Glendale Community College
8 - Google Images
9 - Google Scholar
10 - Handbook of Mineralogy (MinSocAm)
11 - Handbook of Mineralogy (UofA)
12 - MinDAT
13 - Mineralienatlas (Deutsch)
14 - Online Mineral Museum
15 - QUT Mineral Atlas
16 - Ruff.Info
17 - WWW-MINCRYST
18 - YupRocks

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Ask about Mottramite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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

Mottramite

PbCu(VO4)(OH)
Dana No: 41.05.02.02 Strunz No: 08.BH.40
Locality:

Notes: