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A mineral with white foliated crystals resembling petals. Petalite is composed of lithium aluminum silicate. It is found in the United States (Massachusetts, Maine), Sweden and on the island of Elba. Petalite is used as a high melting point flux in ceramic glazes and glass. Additionally, a mixture of 60% petalite and 40% plastic clay will produce a ceramic with very low thermal expansion.

Synonyms and Related Terms

lithium feldspar; petalita (Esp.); Pethalit (Deut.)


Alkaline. Skin contact may causes irritation or burns.

Physical and Chemical Properties

Luster = vitreous. Streak = white. May be transparent or translucent

Composition LiAl(Si2O5)2
CAS 1302-66-5
Mohs Hardness 6.0 - 6.5
Density 2.39-2.46

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