Menilite is a greyish-brown form of the mineraloid opal. It is also known as liver opal or leberopal (German), due to its color. It is called menilite because it was first described from Ménilmontant (Paris), France, where it occurs as concretions within bituminous early Oligocene Menilite shales. ... Found on http://en.wikipedia.org/wiki/Menilite
<chemical> A chemical so called because it is found at Menilmontant, near Paris. ... Synonym: opal. ... (21 Jun 1999) ... Found on http://www.encyclo.co.uk/local/20973
Men'i·lite noun [ French ménilite ; -- so called because it is found at Ménil montant, near Paris.] (Min.) See Opal . Found on http://www.encyclo.co.uk/webster/M/47