is a very rare secondary mineral found associated with
brown coal and lignite deposits. It is an organic compound
as it is derived from coal. Its name is from the Greek
word "melis" for "honey" in allusion
to its typical color although it is also found colorless
and in shades of brown.
is only found in a few locations including Germany,
from Artern, Thuringia, and near Bitterfeld, Saxony-Anhalt.
At Lusice, near Bílina, Valchov, and Boskovice, Czech
Republic. Large crystals from the Csordakút mine, Tatabánya,
Hungary. From Malevka, Bogoroditsk district, southeast
of Tula, Russia.