Mountain green is a light bluish green colour that appears to be mixed with a little grey. This modification also includes the seldadon green. Its name has been borrowed from the paint which is resembles. Examples of it found among the fossils are green chert, green talc, aquamarine; but in the latter it is very pale.
Source: Von den äußerlichen Kennzeichen der Foßilien, abgefaßt von Abraham Gottlob Werner, Vienna 1785