Mottramite Mineral Data
General Mottramite Information
Chemical Formula:
PbCu(VO4)(OH)
Composition:
Molecular Weight = 402.69 gm
Vanadium 12.65 % V 22.58 % V2 O5
Copper 15.78 % Cu 19.75 % CuO
Hydrogen 0.25 % H 2.24 % H2 O
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 - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pnam
X Ray Diffraction:
By Intensity(I/Io ): 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:
PEMottramite = 919.10 barns/electronU=PEMottramite x r Electron 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 21 21 21 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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Mottramite
PbCu(VO4)(OH)
Dana No: 41.05.02.02 Strunz No: 08.BH.40
Locality:
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