Petalite
NE
$2.95
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