... fibrous, needle-like, flake an Dihydrate gypsum’ chemical formula is CaSO4•2H2O, Pure gypsum is transparent or colorless, with fibrous, needle-like, flake ... from the production-like look, with transparent plaster, fiber plaster, alabaster, flake gypsum, clay earth plaster or gypsum.Purposes:1.by rinsing after drying retarder for ...