Petterdite Mineral Data

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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 Zeehan–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

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Petterdite

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

Notes: