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Menilite is a greyish-brown form of the
/ref> It is also known as ''liver opal'' or ''leberopal'' (German), due to its color. It is called menilite because it was first described from
Menilite is a greyish-brown form of the mineraloid
A mineraloid is a naturally occurring mineral-like substance that does not demonstrate crystallinity. Mineraloids possess chemical compositions that vary beyond the generally accepted ranges for specific minerals. For example, obsidian is an amor ...
opal.Menilite on Mindat.org/ref> 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
Ménilmontant () is a neighbourhood of Paris, situated in the city's 20th arrondissement. It is roughly defined as the area north of the Père Lachaise Cemetery, south of Parc de Belleville, and between ''Avenue Jean-Aicard'' on the west and ...
( Paris), France, where it occurs as concretions within bituminous Early Oligocene Menilite Shale
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 ...
s.
See also
*Geyserite
Geyserite, or siliceous sinter, is a form of opaline silica that is often found as crusts or layers around hot springs and geysers. Botryoidal geyserite is known as fiorite. Geyserite is porous due to the silica enclosing many small cavities. Sil ...
* Hyalite
Hyalite is a transparent form of opal with a glassy lustre. It may exhibit an internal play of colors if natural inclusions are present. It is also called Muller's glass, water opal, and jalite. Müller's glass is named after its discoverer, Fra ...
References
Opals {{Mineral-stub