• Webster's Revised Unabridged Dictionary
    • n Petalite (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.
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Century Dictionary and Cyclopedia
    • n petalite A 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.
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Webster's Revised Unabridged Dictionary
Cf. F. p├ętalite,


In science:

Chemical element Li is present at minerals which representatives are petalite and spodumene.
Fugacity of condensed media