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Petterdite

Big Photo

Callenberg North (No. 1) open cut, Callenberg, Glauchau, Saxony, Germany
© Thomas Witzke

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Formula:
PbCr
3+
2
(CO
 
3
)
 
2
(OH)
 
4
·H
 
2
O
System:OrthorhombicColour:Lilac
Lustre:PearlyHardness:2
Name:Named for William Frederick Petterd (1849-1910)


The Cr(III) analogue of dundasite.
See also Unnamed (Ca-analogue of petterdite).

Classification of Petterdite

IMA status:Approved
Nickel-Strunz 10th (pending) edition ID:5.DB.10

5 : CARBONATES (NITRATES)
D : Carbonates with additional anions, with H2O
B : With large and medium-sized cations
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Type Occurrence of Petterdite

Type Locality:Red Lead Mine, Dundas mineral field, Zeehan district, Tasmania, Australia

Physical Properties of Petterdite

Lustre:Pearly
Diaphaneity (Transparency):Translucent
Colour:Lilac
Streak:Violet, pale
Hardness (Mohs):2
Comment:Estimated
Cleavage:Imperfect/Fair
Fair parallel to {100} also possibly {010}
Density (calculated):3.97 g/cm3

Crystallography of Petterdite

Crystal System:Orthorhombic
Cell Parameters:a = 9.079(3) Å, b = 16.321(9) Å, c = 5.786(7) Å
Ratio:a:b:c = 0.556 : 1 : 0.355
Unit Cell Volume:V 857.36 ų (Calculated from Unit Cell)

Optical Data of Petterdite

Type:Biaxial (-)
RI values: nα = 1.704 nβ = 1.802 nγ = 1.842
Maximum Birefringence:δ = 0.138

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Very High
Dispersion:r > v weak

Chemical Properties of Petterdite

Formula:
PbCr
3+
2
(CO
 
3
)
 
2
(OH)
 
4
·H
 
2
O
Essential elements:C, Cr, H, O, Pb
All elements listed in formula:C, Cr, H, O, Pb

Relationship of Petterdite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
5.DB.05Alumohydrocalcite
CaAl
 
2
(CO
 
3
)
 
2
(OH)
 
4
·3H
 
2
O
5.DB.05Nasledovite
PbMn
 
3
Al
 
4
(CO
 
3
)
 
4
SO
 
4
O
 
5
·5H
 
2
O
5.DB.05Para-alumohydrocalcite
CaAl
 
2
(CO
 
3
)
 
2
(OH)
 
4
·6H
 
2
O
5.DB.05UM1977-02-CO:AlCaH
Ca
 
3
Al
 
2
O
 
6
(CO
 
3
)
 
3
·32H
 
2
O
5.DB.10Dresserite
BaAl
 
2
[(OH)
 
2
|CO
 
3
]
 
2
 · H
 
2
O
5.DB.10Dundasite
PbAl
 
2
[(OH)
 
2
|CO
 
3
]
 
2
 · H
 
2
O
5.DB.10Montroyalite
Sr
 
4
Al
 
8
[(OH,F)
 
26
|(CO
 
3
)
 
3
] · 10-11H
 
2
O
5.DB.10Strontiodresserite
(Sr,Ca)Al
 
2
[(OH)
 
2
|CO
 
3
]
 
2
 · H
 
2
O
5.DB.10Kochsándorite
CaAl
 
2
(CO
 
3
)
 
2
(OH)
 
4
 · H
 
2
O
5.DB.15Hydrodresserite
BaAl
 
2
[(OH)
 
2
|CO
 
3
]
 
2
 · 3H
 
2
O
5.DB.20Schuilingite-(Nd)
PbCu(Nd,Gd,Sm,Y)(CO
 
3
)
 
3
(OH)·1.5H
 
2
O
5.DB.25Sergeevite
Ca
 
2
Mg
 
11
(CO
 
3
)
 
13
·10H
 
2
O
5.DB.30Szymańskiite
Hg
 
16
(Ni,Mg)
 
6
(CO
 
3
)
 
12
(OH)
 
12
(H
 
3
O)
 
8
·3H
 
2
O

Other Names for Petterdite

Synonyms:
IMA1999-034
Other Languages:
German:Petterdit
Spanish:Petterdita

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Petterdite

Reference List:Birch, W.D., U. Kolitsch, T. Witzke, L. Nasdala and R. S. Bottrill (2000): Petterdite, the Cr-dominant analogue of dundasite: a new mineral species from Dundas, Tasmania, Australia and Callenberg, Saxony, Germany. Canadian Mineralogist: 38: 1467-1476.

Internet Links for Petterdite

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  • Raman and XRD data at RRUFF project
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  • Petterdite details from Handbook of Mineralogy (PDF)
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    Localities for Petterdite

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