Petterdite
A valid IMA mineral species
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About Petterdite
William Frederick Petterd
Formula:
PbCr3+2(CO3)2(OH)4 · H2O
Colour:
Pale to deep lilac, pinkish violet, pale gray
Lustre:
Pearly, Earthy
Hardness:
2
Specific Gravity:
3.947 (Calculated)
Crystal System:
Orthorhombic
Member of:
Name:
The name petterdite was first used by Twelvetrees for a mineral that was later shown to be a P-bearing mimetite, and hence discredited (see Petterdite (of Twelvetrees).
This mineral was named by W.D. Birch, U. Kolitsch, T. Witzke, L. Nasdala, and R.S. Bottrill in 2000 in honor of William Frederick Petterd (13 July 1849, Hobart Town, Tasmania, Australia - 15 April 1910, Launceston, Tasmania, Australia), boot importer and scientist. He published many papers on conchology and geology and wrote the Catalogue of the Minerals of Tasmania. He also described dundasite, the Al analogue of this mineral.
This mineral was named by W.D. Birch, U. Kolitsch, T. Witzke, L. Nasdala, and R.S. Bottrill in 2000 in honor of William Frederick Petterd (13 July 1849, Hobart Town, Tasmania, Australia - 15 April 1910, Launceston, Tasmania, Australia), boot importer and scientist. He published many papers on conchology and geology and wrote the Catalogue of the Minerals of Tasmania. He also described dundasite, the Al analogue of this mineral.
Unique Identifiers
Mindat ID:
7099
Long-form identifier:
mindat:1:1:7099:3
GUID
(UUID V4):
(UUID V4):
8cb69d0d-362c-4da0-9b96-b8cc945bae9a
IMA Classification of Petterdite
Approved
IMA Formula:
PbCr2(CO3)2(OH)4 · H2O
First published:
2000
Type description reference:
Classification of Petterdite
5.DB.10
5 : CARBONATES (NITRATES)
D : Carbonates with additional anions, with H2O
B : With large and medium-sized cations
5 : CARBONATES (NITRATES)
D : Carbonates with additional anions, with H2O
B : With large and medium-sized cations
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Pte | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Petterdite
Pearly, Earthy
Transparency:
Translucent
Colour:
Pale to deep lilac, pinkish violet, pale gray
Streak:
Violet, pale
Hardness:
2 on Mohs scale
Comment:
Estimated
Cleavage:
Imperfect/Fair
Fair parallel to {100} also possibly {010}
Fair parallel to {100} also possibly {010}
Parting:
No parting.
Comment:
"Fracture and tenacity could not be observed."
Density:
3.947 g/cm3 (Calculated)
Optical Data of Petterdite
Type:
Biaxial (-)
RI values:
nα = 1.704(5) nβ = 1.802 nγ = 1.842(5)
2V:
Calculated: 62°
Max Birefringence:
δ = 0.138
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
r > v weak
Optical Extinction:
X = a; Y = b; Z = c.
Pleochroism:
Visible
Comments:
X = Y = colorless to pale grayish pink; Z = grayish pink.
Comments:
Absorption: X < Z.
Chemistry of Petterdite
Mindat Formula:
PbCr3+2(CO3)2(OH)4 · H2O
Crystallography of Petterdite
Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
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 V:
857.36 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Crystals are poorly developed, flattened on {010}, and slightly elongate along [001] or, less commonly, [100]. Terminations, in the direction of [001], typically have a frayed appearance.
Twinning:
No twinning.
Comment:
Space Group: [P bnm] (by analogy to dundasite).
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 7.937 Å | (100) |
| 3.633 Å | (70) |
| 4.686 Å | (50b) |
| 3.270 Å | (40) |
| 2.718 Å | (40) |
| 2.690 Å | (40) |
| 6.091 Å | (30) |
Comments:
Red Lead Mine, Tasmania, Australia. Data from the type description.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47c : [Carbonates, phosphates, borates, nitrates] | |
| 47e : [Vanadates, chromates, manganates] |
Type Occurrence of Petterdite
General Appearance of Type Material:
Earthy, pale purplish mineral in crocoite-bearing gossan.
Place of Conservation of Type Material:
Museum Victoria, Melbourne, Australia, M38601.
Associated Minerals at Type Locality:
Reference:
Birch, W.D., Kolitsch, U., Witzke, T., Nasdala, L., Bottrill, R.S. (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.
Synonyms of Petterdite
Other Language Names for Petterdite
German:Petterdit
Spanish:Petterdita
Relationship of Petterdite to other Species
Member of:
Other Members of this group:
| Alumohydrocalcite | CaAl2(CO3)2(OH)4 · 4H2O | Tric. 1 : P1 |
| Dresserite | BaAl2(CO3)2(OH)4 · H2O | Orth. mmm (2/m 2/m 2/m) |
| Dundasite | PbAl2(CO3)2(OH)4 · H2O | Orth. mmm (2/m 2/m 2/m) |
| Grguricite | CaCr2(CO3)2(OH)4 · 4H2O | Tric. 1 : P1 |
| Hydrodresserite | BaAl2(CO3)2(OH)4 · 3H2O | Tric. 1 : P1 |
| Kochsándorite | CaAl2(CO3)2(OH)4 · H2O | Orth. mmm (2/m 2/m 2/m) : Pnma |
| Strontiodresserite | SrAl2(CO3)2(OH)4 · H2O | Orth. mmm (2/m 2/m 2/m) |
| Unnamed (Ca-analogue of Petterdite) | CaCr3+2(CO3)2(OH)4 · H2O |
Common Associates
Associated Minerals Based on Photo Data:
| 16 photos of Petterdite associated with Crocoite | PbCr6+O4 |
| 4 photos of Petterdite associated with Cerussite | PbCO3 |
| 3 photos of Petterdite associated with Philipsbornite | PbAl3(AsO4)(AsO3OH)(OH)6 |
| 3 photos of Petterdite associated with Anglesite | PbSO4 |
| 2 photos of Petterdite associated with Grimaldiite | CrO(OH) |
| 1 photo of Petterdite associated with Chrome-Cerussite | PbCO3 |
| 1 photo of Petterdite associated with Galena | PbS |
Related Minerals - Strunz-mindat Grouping
| 5.DB. | Grguricite | CaCr2(CO3)2(OH)4 · 4H2O |
| 5.DB.05 | Alumohydrocalcite | CaAl2(CO3)2(OH)4 · 4H2O |
| 5.DB.05 | Nasledovite | PbMn3Al4(CO3)4(SO4)O5 · 5H2O |
| 5.DB.05 | Para-alumohydrocalcite | CaAl2(CO3)2(OH)4 · 6H2O |
| 5.DB.05 | UM1977-02-CO:AlCaH | Ca6Al2(CO3)3O6 · 32H2O |
| 5.DB.10 | Dresserite | BaAl2(CO3)2(OH)4 · H2O |
| 5.DB.10 | Dundasite | PbAl2(CO3)2(OH)4 · H2O |
| 5.DB.10 | Montroyalite | Sr4Al8(CO3)3(OH,F)26 · 10-11H2O |
| 5.DB.10 | Strontiodresserite | SrAl2(CO3)2(OH)4 · H2O |
| 5.DB.10 | Kochsándorite | CaAl2(CO3)2(OH)4 · H2O |
| 5.DB.10 | Unnamed (Ca-analogue of Petterdite) | CaCr3+2(CO3)2(OH)4 · H2O |
| 5.DB.15 | Hydrodresserite | BaAl2(CO3)2(OH)4 · 3H2O |
| 5.DB.20 | Schuilingite-(Nd) | PbCu(Nd,Gd,Sm,Y)(CO3)3(OH) · 1.5H2O |
| 5.DB.25 | Sergeevite | Ca2Mg11(CO3)9(HCO3)4(OH)4 · 6H2O |
| 5.DB.30 | Szymańskiite | [H3O]+8[Hg2]2+8(Ni,Mg)6[CO3]12(OH)12 · 3H2O |
| 5.DB.35 | Lusernaite-(Y) | Y4Al(CO3)2(OH)10F · 6H2O |
| 5.DB.40 | Putnisite | SrCa4Cr3+8(CO3)8SO4(OH)16 · 23H2O |
Fluorescence of Petterdite
Not fluorescent.
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Petterdite
mindat.org URL:
https://www.mindat.org/min-7099.html
Please feel free to link to this page.
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External Links:
Mineral Dealers:
References for Petterdite
Reference List:
Localities for Petterdite
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Australia (TL) | |
| Birch et al. (2000) +1 other reference |
Germany | |
| Birch et al. (2000) |
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Red Lead Mine, Dundas mineral field, Zeehan mining district, West Coast municipality, Tasmania, Australia