What is "ludlamite"

Ludlamite \Lud"lam*ite\, n. [Named after Mr. Ludlam, of London.] (Min.) A mineral occurring in small, green, transparent, monoclinic crystals. It is a hydrous phosphate of iron.

n. (context mineralogy English) A monoclinic-prismatic mineral containing hydrogen, iron, magnesium, manganese, oxygen, and phosphorus.

Ludlamite is a rare phosphate mineral with formula: (Fe,Mn,Mg)(PO)·4HO.

It was first described in 1877 for an occurrence in Wheal Jane mine in Cornwall, England and named for English mineralogist Henry Ludlam (1824–1880).