Petterdite Mineral Data

General Petterdite Information

Chemical Formula:

PbCr+++2(CO3)2(OH)4•H2O

Composition:

Molecular Weight = 510.01 gm

Strontium 1.72 % Sr 2.03 % SrO

Aluminum 2.12 % Al 4.00 % Al₂O₃

Chromium 15.29 % Cr 22.35 % Cr₂O₃

Hydrogen 1.11 % H 9.89 % H₂O

Lead 40.63 % Pb 43.76 % PbO

Carbon 4.95 % C 18.12 % CO₂

Oxygen 34.19 % O

______ ______

100.00 % 100.16 % = TOTAL OXIDE

Empirical Formula:

PbSr_0.1Cr_1.5Al_0.4(CO₃)_2.1(OH)_3.6•(H₂O)

Environment:

Supergene product associated with crocoite and anglesite ores. Cr-analogue of dundasite.

IMA Status:

Approved IMA 1999 (Dana # Added)

Locality:

Red Lead mine in the Zeehan-Dundas region of northwestern Tasmania. Link to MinDat.org Location Data.

Name Origin:

Named for amateur mineralogist William Frederick Petterd (1849-1910), an amateur collector who published several significant catalogues on the mineralogy of Tasmania.

Synonym:

IMA1999-034

Petterdite Image

Images:

Petterdite

Comments: Pinkish-violet crystalline aggregate of petterdite on matrix.
Location: Callenberg North (no. 1) open cut, Callenberg, Glauchau, Saxony, Germany. Scale: Picture size 2.5 mm.
© Thomas Witzke / Abraxas-Verlag

Images:

Petterdite

Comments: Petterdite (Pe) forming a thin pink layer in grey-yellow anglesite (At) and cerussite, replacing galena (Gn), overgrown by red-yellow crocoite (Cr) and brown goethite (Gt). (CanMin, 38:1469).
Location: Red Lead mine, on the Zeehanâ€“Dundas mining field in northwestern Tasmania, Australia.. Scale: Field of view: 15 9 mm.
© Canadian Mineralogist

Petterdite Crystallography

Axial Ratios:

a:b:c =0.5562:1:0.3545

Cell Dimensions:

a = 9.079, b = 16.321, c = 5.786, Z = 4; V = 857.36 Den(Calc)= 3.95

Crystal System:

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

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

By Intensity(I/I_o): 7.937(1)(110), 3.633(0.7)(131), 4.686(0.5)(021,111),2.718(0.4)(022,060), 2.69(0.4)(241,301), 3.27(0.4)(221), 1.781(0.3), 2.101(0.3), 2.405(0.3),

Physical Properties of Petterdite

Cleavage:

{100} Fair, {010} Poor

Color:

Pale gray, Pinkish violet.

Diaphaneity:

Translucent

Habit:

Encrustations - Forms crust-like aggregates on matrix.

Habit:

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

Hardness:

2 - Gypsum

Luster:

Pearly

Streak:

pale violet

Optical Properties of Petterdite

Gladstone-Dale:

CI calc= 0.039 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1981,KC= 0.2061
Ncalc = 1.81

Optical Data:

Biaxial (-), a=1.704, b=1.802, g=1.842, bire=0.1380

Calculated Properties of Petterdite

Electron Density:

Bulk Density (Electron Density)=3.60 gm/cc
note: Specific Gravity of Petterdite =3.95 gm/cc.

Fermion Index:

Fermion Index = 0.1
Boson Index = 0.9

Photoelectric:

PE_Petterdite= 690.13 barns/electron
U=PE_Petterdite x rElectron Density=2,484.36 barns/cc.

Radioactivity:

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

Petterdite Classification

Dana Class:

16b.02.01.04 (16b)Carbonates - Hydroxyl or Halogen

(16b.02)where (A)m (B)n (XO3)p Zq · x(H2O), with (m+n):p=3:2

(16b.02.01)Dundasite Group

16b.02.01.01 Dundasite PbAl2(CO3)2(OH)4•(H2O) Pbmm 2/m 2/m 2/m

16b.02.01.02 Dresserite BaAl2(CO3)2(OH)4•(H2O) Pbmm 2/m 2/m 2/m

16b.02.01.03 Strontiodresserite (Sr,Ca)Al2(CO3)2(OH)4•(H2O) Pbmm 2/m 2/m 2/m

16b.02.01.04 Petterdite! PbCr2(CO3)2(OH)4•H2O Pbnm 2/m 2/m 2/m

16b.02.01.05 Kochsandorite! CaAl2(CO3)2(OH)4•H2O P nma 2/m 2/m 2/m

Strunz Class:

05.DB.10 05 - CARBONATES (NITRATES)

05.D - Carbonates with Additional Anions, with H2O

05.DB -With large and medium-sized cations

05.DB.10 Dresserite BaAl2(CO3)2(OH)4•(H2O) Pbmm 2/m 2/m 2/m

05.DB.10 Dundasite PbAl2(CO3)2(OH)4•(H2O) Pbmm 2/m 2/m 2/m

05.DB.10 Kochsandorite! CaAl2(CO3)2(OH)4•H2O P nma 2/m 2/m 2/m

05.DB.10 Strontiodresserite (Sr,Ca)Al2(CO3)2(OH)4•(H2O) Pbmm 2/m 2/m 2/m

05.DB.10 Petterdite! PbCr2(CO3)2(OH)4•H2O Pbnm 2/m 2/m 2/m

Other Petterdite Information

References:

NAME( AmMin, Vol 86, p 1113) PHYS. PROP.(AmMin, Vol 86, p 1113) OPTIC PROP.(AmMin, Vol 86, p 1113)

See Also:

Links to other databases for Petterdite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (MinSocAm)
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

Search for Petterdite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Petterdite :

A Bijoux Google Search for Petterdite
Adam's Minerals Google Search for Petterdite
Cape Minerals Google Search for Petterdite
Dakota Matrix Minerals Google Search for Petterdite
Excalibur Mineral Corp. Google Search for Petterdite
Exceptional Minerals Google Search for Petterdite
John Betts Fine Minerals Search for Petterdite
McDougall Minerals Google Search for Petterdite
Mineral News Website Link
Rock and Mineral Shows Google Search for Petterdite
Weinrich Minerals, Inc. Google Search for Petterdite

Ask about Petterdite 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 Petterdite Specimen Label here :

Petterdite

PbCr+++2(CO3)2(OH)4•H2O
Dana No: 16b.02.01.04 Strunz No: 05.DB.10
Locality:

Notes: