Mathewrogersite Mineral Data

General Mathewrogersite Information

Chemical Formula:

Pb7(Fe,Cu)Al3GeSi12O36•(OH,H2O)6

Composition:

Molecular Weight = 2,678.79 gm

Aluminum 3.02 % Al 5.71 % Al₂O₃

Iron 1.56 % Fe 2.01 % FeO

Copper 0.59 % Cu 0.74 % CuO

Silicon 12.58 % Si 26.92 % SiO₂

Germanium 2.71 % Ge 3.91 % GeO₂

Hydrogen 0.30 % H 2.69 % H₂O

Lead 54.14 % Pb 58.32 % PbO

Oxygen 25.09 % O

______ ______

100.00 % 100.30 % = TOTAL OXIDE

Empirical Formula:

Pb₇Fe²⁺_0.75Cu_0.25Al₃GeSi₁₂O₃₆(OH)₄•2(H₂O)

Environment:

Corroded Pb-Zn ores of the lower oxidation zone.

IMA Status:

Approved IMA 1986

Locality:

Tsumeb, Namibia. Link to MinDat.org Location Data.

Name Origin:

Named to honor Mathew Rogers, first European prospector at Tsumeb, Namibia.

Name Pronunciation:

Mathewrogersite + Pronunciation

Mathewrogersite Crystallography

Axial Ratios:

a:c = 1:5.43573

Cell Dimensions:

a = 8.457, c = 45.97, Z = 3; V = 2,847.33 Den(Calc)= 4.69

Crystal System:

Trigonal Space Group: R 3,R 3-,R 32,R 3m,R 3m-

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

By Intensity(I/I_o): 3.257(1), 15.3(0.7), 2.03(0.7),1.762(0.6), 2.766(0.6), 7.68(0.6), 4.08(0.5),

Physical Properties of Mathewrogersite

Cleavage:

{0001} Perfect

Color:

Colorless, White, Light green yellow.

Density:

4.7

Diaphaneity:

Translucent

Habit:

Hexagonal - Six-sided crystal shape in cross-section or habit.

Habit:

Platy - Sheet forms (e.g. micas).

Hardness:

2 - Gypsum

Luster:

Vitreous - Pearly

Streak:

white

Optical Properties of Mathewrogersite

Gladstone-Dale:

CI meas= 0.004 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.002 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1658,KPDmeas= 0.1654,KC= 0.1661
Ncalc = 1.78

Optical Data:

Uniaxial (-), e=1.745, w=1.81, bire=0.0650.

Calculated Properties of Mathewrogersite

Electron Density:

Bulk Density (Electron Density)=4.14 gm/cc
note: Specific Gravity of Mathewrogersite =4.69 gm/cc.

Fermion Index:

Fermion Index = 0.12
Boson Index = 0.88

Photoelectric:

PE_{Mathewrogersite}= 943.67 barns/electron
U=PE_{Mathewrogersite} x rElectron Density=3,911.51 barns/cc.

Radioactivity:

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

Mathewrogersite Classification

Dana Class:

78.03.01.01 (78)Unclassified silicates

(78.03)possible cyclosilicates

(78.03.01)Dana Group

78.03.01.01 Mathewrogersite Pb7(Fe,Cu)Al3GeSi12O36•(OH,H2O)6 R 3,R 3-,R 32,R 3m,R 3m- Trig

Strunz Class:

09.CJ.55 09 - SILICATES (Germanates)

09.C - Cyclosilicates

09.CJ -[Si6O18]12- 6-membered single rings (sechser-Einfachringe),

09.CJ.55 Mathewrogersite Pb7(Fe,Cu)Al3GeSi12O36•(OH,H2O)6 R 3,R 3-,R 32,R 3m,R 3m- Trig

Other Mathewrogersite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Am.Min.,Vol.72,p1025,1987)

See Also:

Links to other databases for Mathewrogersite :
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 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Mathewrogersite

Pb7(Fe,Cu)Al3GeSi12O36•(OH,H2O)6
Dana No: 78.03.01.01 Strunz No: 09.CJ.55
Locality:

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