leucite
Noun
Meaning
A mineral having a glassy fracture, occurring in translucent trapezohedral crystals. It is a silicate of alumina and potash. It is found in the volcanic rocks of Italy, especially at Vesuvius.
A leucoplast.
Source: Webster's dictionarySynonyms
feldspar
apatite
albite
galena
chalcopyrite
anorthite
covellite
heulandite
eudialyte
amazonite
bornite
andesine
adularia
cancrinite
analcime
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Rocks that contain leucite or nepheline, either partly or a wholly replacing felspar, are not included in this table.
They may be of considerable size like the grey, rounded leucite crystals found on the sides of Vesuvius.