
1) Lead mineral 2) Monoclinic mineral
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https://www.crosswordclues.com/clue/lanarkite

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. ...
Found on
http://en.wikipedia.org/wiki/Lanarkite

• (n.) A mineral consisting of sulphate of lead, occurring either massive or in long slender prisms, of a greenish white or gray color.
Found on
http://thinkexist.com/dictionary/meaning/lanarkite/
Lan'ark·ite 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.
Found on
http://www.encyclo.co.uk/webster/L/10

Lanarkite is a mineral consisting of sulphate of lead, occurring either massive or in long slender prisms, of a greenish-white or grey colour.
Found on
http://www.probertencyclopaedia.com/browse/HL.HTM

Lead sulfate, basic
Found on
http://www.translationdirectory.com/glossaries/glossary075.htm
No exact match found.