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Mixture containing kaolinite.

Named in 1838 by August Breithaupt from the Greek αγαυξητος, meaning "not increasing", because the mineral did not swell in a blowpipe flame.

Originally reported from Hradiste (Bezovka; Debersche - Tal), Bílina (Bilin), Ústí Region, Bohemia (Böhmen; Boehmen), Czech Republic.