Macphersonite

carbonate

susanite

Formula: Pb4(SO4)(CO3)2(OH)2
Compound carbonate, polymorph of leadhillite and susannite
Specific gravity: 6.5
Hardness: 2½ to 3
Streak: White
Colour: Colourless, white, very pale amber
Solubility: Soluble in dilute acids AM 70.874
Environments

Hydrothermal environments

Macphersonite is an uncommon secondary mineral in the zone of oxidation of lead deposits, associated with leadhillite, susannite, cerussite, caledonite, pyromorphite, scotlandite, mattheddleite, galena and quartz (HOM).

At the the Argentolle Mine, Saint-Prix, Saone-et-Loire, France, macphersonite is found with susannite, cerussite, pyromorphite, galena, quartz and scotlandite (AM 70.874).

At Red Gill, Allerdale, Cumbria, England, UK, Macphersonite, the rarest of the basic lead-sulphate carbonates, has been identified on a single specimen, in a cavity in quartz veinstone with susannite, caledonite and mattheddleite (JRS 11.39).

At the type locality, the Susanna Mine, Leadhills, South Lanarkshire, Scotland, UK, macphersonite is associated with leadhillite, susannite, cerussite, caledonite and pyromorphite (AM 70.874).

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