Formula: PbAl2(CO3)2(OH)4.H2O
Hydrated carbonate containing hydroxyl, dresserite group
Specific gravity: 3.1 to 3.55
Hardness: 2
Streak: White
Colour: White to colourless to very pale blue
Solubility: Soluble in acids with effervescence

Hydrothermal environments

Dundasite is an uncommon secondary mineral found in the oxidation zone of lead deposits. Associated minerals include cerussite, plattnerite, azurite, malachite, pyromorphite, mimetite, beudantite, duftite, crocoite, gibbsite, allophane, galena and limonite (HOM, Mindat).


At the Hercules Mine, Williamsford, Rosebery district, West Coast municipality, Tasmania, Australia, dundasite occurs with cerussite and gibbsite (Dana).

At the type locality, the Adelaide mine, Dundas mineral field, Zeehan District, West Coast municipality, Tasmania, Australia, dundasite occurs as aggregates of white to pale blue crystals to 1 mm in length; it commonly overgrows crocoite and may in turn be overgrown by cream to white gibbsite, yellow cerussite or, less commonly, a later generation of crocoite (AJM 12.2.81).

At Port Quin Mine, Port Quin, St Minver, Cornwall, England, UK, dundasite is associated with allophane (Dana).

At Killhope, Stanhope, County Durham, England, a single specimen has been found with white pearly flakes of dundasite covering a tiny area on iron-stained cerussite in a small mass of galena (JRS 13.63).

At the Mill Close mine, Wensley, South Darley, Derbyshire, England, UK, dundasite is associated with cerussite, hemimorphite and greenockite (Dana).

At Torr Works Quarry (Merehead Quarry), Cranmore, Mendip, Somerset, England, UK, specimens have been found consisting of calcium-bearing dundasite intergrown with lead-bearing alumohydrocalcite in cavities in a manganese oxide matrix (JRS 13.34).

At Trefriw, Conwy, Wales, UK, dundasite is associated with cerussite and allophane (Dana).

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