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Dundasite

Posted by Ralph Bottrill  
avatar Dundasite
April 12, 2009 01:29PM
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Dundasite
PbAl2[(OH)2|CO3]2 · H2O Monoclinic.

Can you help make this a better article? What good localities have we missed? Can you supply pictures of better specimens than those we show here? Can you give us more and better information about the specimens from these localities? Can you supply better geological or historical information on these localities?
Should the different species be treated in separate articles?


Crocoite and Dundasite, Kapi mine, 10cm© R. Bottrill

This is a relatively rare secondary lead mineral found in the weathering zones of some lead deposits. , It usually occurs in small spherical aggregates of radiating white crystals and also as matted or felted crusts, sometimes with a greenish or bluish exterior.
It was first discovered in the Adelaide Proprietary mine, Dundas, Tasmania and later found in about a #70 localities around the world but the ones mentioned here are the ones of most interest to collectors.

In the Adelaide mine, the type locality, the mineral occurs as an encrustation on ferro-manganese gossan, as botryoidal-fibrous aggregates of white to pale green crystals to 1 mm in length. It commonly overgrows crocoite and may also be overgrown by yellow cerussite and, less commonly, a later generation of crocoite. There is sometimes a thin bright green coating which is an unidentified Cr-bearing silicate mineral (fuchsite?), still under investigation (eg. Tas. Museum X2981; Bottrill et al., in prep.).


Good hand specimens bring prices of maybe $1,000.

1. A System of Mineralogy, Dana, 7th edition, 1951, p.646-649.
2. Mineralogical Record, Australia Issue, Haupt, J., 1988: Minerals of Western Tasmania. 196, 381-388
3. Australian Journal of Mineralogy, (Dundas Issue) Bottrill, R.S., Williams, P., Dohnt, S., Sorrell, S. and Kemp, N.R. (2006). Crocoite and associated minerals from Dundas and other locations in Tasmania. 12, 59-90
4. A Catalogue of the Minerals of Tasmania. Bottrill, R.S. & Baker, W.E. (2008) Bull. 73. Tasmanian Geological Survey

[Ralph Bottrill, 16th Feb 2009]


Dundasite
Australia
Tasmania, Zeehan district, Dundas mineral field, Adelaide Mine (Adelaide Pty Mine; Adelaide Proprietary Mine)

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Field of view: 4.5mm.
[www.mindat.org]
Dundasite overgrowing crocoite. The green surface colour may be due to a thin coating of fuchsite?
50x30 mm.
[www.mindat.org]
Yellowish spheres of Dundasite associated with Crocoite crystals. Field of view 9 mm.
[www.mindat.org]
Balls of Dundasite on Gossan Matrix from the Adelaide mine, the type locality for this mineral. Old time specimen. Specimen size 28mm high.

Kapi Mine, North Dundas, Zeehan district, Tasmania, Australia
[www.mindat.org]
A cute 2.6 by 2.4 cms specimen of small white acicular crystals of Dundasite completely covering first generation Crocoite crystals with some minor later generation of Crocoite and Chrome Cerussite.

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White Dundasite grown over red Crocoite. Picture width is 4mm.


Le Rocheux Mine, Oneux, Theux, Verviers, Liège Province, Belgium
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Field of view: 2 x 1.6 mm.
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Field of view 7 mm.

Le Cantonnier vein, Nontron, Dordogne, Aquitaine, France
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Green pyromorphite un Dundasite sprays
Field is 4,19 x 2,76 mm
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Field of view : 3,5 X 5 mm

Mas Dieu, Mercoirol, Gard, Languedoc-Roussillon, France
[www.mindat.org]
Dundasite balls with Azurite , Malachite and Baryte
Field of view 5,5 mm

Cap Garonne Mine, Pradet, Var, Provence-Alpes-Côte d'Azur, France
[www.mindat.org] Dundasite on Mimetite~1-2mm?
[www.mindat.org] FOV= 3mm

Nagylápa-fõ adit, Parádsasvár (Üveghuta), Mátra Mts., Heves Co., Hungary
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White,fibrous dundasite group.
Width of picture:2mm

Tynagh Mine, Killimor, Co. Galway, Ireland
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Acicular needles of dundasite. Field of view, 1mm x 1mm.

Gonnesa, Carbonia-Iglesias Province, Sardinia, Italy
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sphaeres of acicular white crystals of dundasite area size 4.5 mm

San Giovanneddu Mine (S'Ega Porceddu), Gonnesa, Carbonia-Iglesias Province, Sardinia, Italy
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Field of view: 7mm

San Giovanni Mine, Punta della Torre, Iglesias, Carbonia-Iglesias Province, Sardinia, Italy
[www.mindat.org]
Dundasite - area 3x2 cm.

Monte Trisa, Mercanti Valley, Torrebelvicino, Vicenza Province, Veneto, Italy
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group of azure balls of dundasite up to 1.1 mm


Tsumeb Mine (Tsumcorp Mine), Tsumeb, Otjikoto (Oshikoto) Region, Namibia
[www.mindat.org]
Dundasite is rare enough but this beautiful blue dundasite apparently occured only once and many of the specimens were in all likelihood sold off as plancheite and thus misidentified.
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Tui Mine, Te Aroha, North Island, New Zealand
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Tufts of white dundasite on finer grained, pale blue dundasite spheres (the disputed cupro-dundasite), both on straw cerussite. FOV = ~11mm

Greystones Quarry, Lezant, Callington District, Cornwall, England, UK
[www.mindat.org]
[www.mindat.org]

Trevinnick Mine, St Endellion, Area East of Wadebridge, Wadebridge District, Cornwall, England, UK
[www.mindat.org]
Area 5mm

New Pandora Mine (Pandora Mine; Standard Mine ; Welsh Foxdale Mine), Llanrwst, Gwydyr Forest area, Conwy (Gwynedd; Caernarvonshire), Wales, UK
[www.mindat.org]
Dundasite coating cerussite xls. Collected by Sir Arthur Russell in 1904. Overall size: 12 x 19 x 13 mm

Juanita Mine, Magdalena District, Socorro Co., New Mexico, USA
[www.mindat.org]
White, silky, fibrous crystals of Dundasite with Azurite and pale blue Allophane. Field of view = 3.0 mm

Refs
1. Mineralogical Record, Australia Issue, Haupt, J., 1988: Minerals of Western Tasmania. 196, 381-388
2. Australian Journal of Mineralogy, (Dundas Issue) Bottrill, R.S., Williams, P., Dohnt, S., Sorrell, S. and Kemp, N.R. (2006). Crocoite and associated minerals from Dundas and other locations in Tasmania. 12, 59-90
3. A Catalogue of the Minerals of Tasmania. Bottrill, R.S. & Baker, W.E. (2008) Bull. 73. Tasmanian Geological Survey



Click here to view Best Minerals D and here for Best Minerals A to Z and here for Fast Navigation of completed Best Minerals articles.

Regards,
Ralph



Edited 4 time(s). Last edit at 07/26/2010 06:30AM by Rock Currier.
avatar Re: Dundasite
April 12, 2009 05:54PM
    
Hi Ralph,

I provide you images of Tsumeb specimens.

Please let me know.

Take care and best regards.

Paul.
avatar Re: Dundasite
April 13, 2009 02:30PM
Paul, that would be great thank you
Ralph

Regards,
Ralph
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