Phyllosilicate (sheet silicate), mica group, forms a series with muscovite variety illite (Wiki).
Colour: Colourless when pure, grass green when ferrous iron-bearing
Aluminoceladonite is a low-temperature mineral; along with other phyllosilicate minerals in the muscovite variety
illite-aluminoceladonite series, it has been observed among finely dispersed
mica varieties occurring in sedimentary rocks
There are two co-type localities for aluminoceladonite, Anna chapel, Wiesmath, Bucklige Welt, and Frohsdorf, Lanzenkirchen, both in Industrieviertel, Lower Austria, Austria.
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