What is "lanarkite"

Lanarkite \Lan"ark*ite\, n. [From Lanarkshire, a county in Scotland.] (Min.) A mineral consisting of sulphate of lead, occurring either massive or in long slender prisms, of a greenish white or gray color.

n. (context mineralogy English) A mineral form of lead sulfate with the chemical formula Pb₂(SO₄)O, an oxidation product of galena, whose acicular monoclinic prismatic crystals are white or light green.

Lanarkite is a mineral, a form of lead sulfate with formula Pb(SO)O. It was originally found at Leadhills in the Scottish county of Lanarkshire, hence the name. It forms white or light green, acicular monoclinic prismatic crystals, usually microscopic in size. It is an oxidation product of galena.