Noun.  (mineralogy) A complex phosphate with the chemical formula Ca2(Mg,Fe)(Mg,Fe,Mn,Al)4Be4(OH)4(PO4)6ยท6H2O, having a pale to dark olive-green colour.

This is an unmodified, but possibly outdated, definition from Wiktionary and used here under the Creative Commons license. Wiktionary is a great resource. If you like it too, please donate to Wikimedia.

This entry was last updated on RefTopia from its source on 3/20/2012.