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Menilite
Menilite

Menilite is a greyish-brown form of the mineraloid opal. [1] 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, [1] where it occurs as concretions within bituminous Early Oligocene Menilite Shales.

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References