petalite
noun
pet·al·ite
-ˌīt
plural -s
: a usually white mineral LiAl(Si2O5)2 consisting of a lithium aluminum silicate occurring in foliated cleavable masses or in monoclinic crystals (hardness 6–6.5, specific gravity 2.39–2.46)
Word History
Etymology
German petalit, from Greek petalon leaf + German -it -ite