1) An old unstandardized term that has been used for Gypsum.
2) More recently, the term satin white has been used for a bulky, opaque, white paper filling material. This filler, also called calcium sulfoaluminate, is made by the reaction of Aluminum sulfate, Hydrated lime and potash alum.
Physical and Chemical Properties
2) Calcium sulfoaluminate
- Particle size = about 1.5 x 0.15 (elongated crystals)
- Refractive Index = 1.46