Petalite, also known as castorite, is a lithium aluminium tectosilicate mineral LiAlSi₄O₁₀, crystallizing in the monoclinic system. Petalite is a member of the feldspathoid group.

Hardness: 6 - 6.5
Formula: LiAlSi4O10: Monoclinic
Crystal Class: Prismatic (2/m); (same H-M symbol)
Crystal Habit: Tabular prismatic crystals and columnar masses
Melting Point: 1350 °C
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