nPetalite(Min) A rare mineral, occurring crystallized and in cleavable masses, usually white, or nearly so, in color. It is a silicate of aluminia and lithia.
Century Dictionary and Cyclopedia
npetaliteA rare mineral, having a leaf-like cleavage, usually occurring in masses of a milk-white color, often tinged with gray, red, or green. It is a silicate of aluminium and lithium. The alkali lithia was first discovered in this mineral. Castorite is a variety found on the island of Elba, Italy.
Webster's Revised Unabridged Dictionary
Cf. F. pétalite,
Chemical element Li is present at minerals which representatives are petalite and spodumene.