Definify.com

Webster 1913 Edition

Noun.

[From

Lanark

shire, 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.

lanarkite ‎(plural not attested)

(mineralogy) 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.