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Lanarkite
Chemical Formula	Pb2(SO4)O
Species	Sulfates
Crystal System	Monoclinic
Mohs Scale	2
Specific Gravity	6.4-6.8
Color	Greenish white, greyish-white, more rarely pale-yellow; colourless in transmitted light.
Streak	White
Luster	Adamantine, Resinous, Pearly
Refractive Index	n = 1.928 n = 2.007 n = 2.036
Diaphaneity	Transparent, Translucent
Cleavage	PerfectPerfect on , imperfect on and ; also on .
Fracture	Splintery
Crystal Habit：Crystals prismatic, elongated parallel , typically microscopic and in clusters or sprays; massive.
Geological Setting：A secondary mineral of lead deposits, typically formed by the alteration of galena or other secondary minerals formed from galena.

Lanarkite is a mineral, a form of lead sulfate with formula Pb₂(SO₄)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.