Jurbanite
Jurbanite is a sulfate mineral with the chemical formula AlSO₄·5H₂O. Its molecular weight is 230.13 g/mol. It crystallizes in the monoclinic system and is dimorphous with the orthorhombic mineral rostite.
Jurbanite occurs as a secondary mineral in... Wikipedia
Crystal class: Prismatic (2/m); (same H-M symbol)
Crystal habit: Small crystals and stalactitic forms
Crystal system: Monoclinic