A hydrated calcium aluminum sulfate hydroxide, forming prismatic or acicular crystals. It's associated with promoting clarity, structure, and order. (Also found in cement chemistry).
Colorless, White, Yellowish, Pale Green, Pinkish
Ettringite is classified as a sulfate minerals mineral which typically crystallizes in the trigonal system. Its chemical formula is Ca6Al2(SO4)3(OH)12·26H2O. Common crystal habits include acicular growth, striated prismatic crystals; fibrous to cottonlike.