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Leadhillite is a lead sulfate carbonate hydroxide mineral, often associated with anglesite. It has the formula Pb4SO4(CO3)2(OH)2. Leadhillite crystallizes in the monoclinic system, but forms pseudo-hexagonal forms due to crystal twinning. It forms transparent to translucent variably colored adamantine crystals. It is quite soft with a Mohs hardness of 2.5 and a relatively high specific gravity of 6.26 to 6.55.
Additional recommended knowledge
It was discovered in 1832 in the Susannah Mine, Leadhills in the county of Lanark, Scotland.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Leadhillite". A list of authors is available in Wikipedia.|