Ettringite
Chemical compound
Ettringite is a hydrous calcium aluminium sulfate mineral with formula: Ca₆Al₂(SO₄)₃(OH)₁₂·26H₂O. It is a colorless to yellow mineral crystallizing in the trigonal system. The prismatic crystals are typically colorless, turning white on partial... Wikipedia
IMA symbol: Ett
Solubility: Partially soluble in water
Cleavage: Perfect on
Color: Colorless, pale yellow, milky white
Crystal habit: Acicular growth, striated prismatic crystals; fibrous to cottonlike
Crystal system: Trigonal