We can supply big quantity gypsum/alabaster powder. Mineralogical composition: X-ray diffraction / petrography Gypsum (so4ca.2h2o).................... 92, 05% Celestine ........................................ 2, 6 % Carbonates................................... 1, 95% Quartz.............................................. 1, 3 % Clay minerals............... 2, 1% Chemical composition Atomic emission spectrometry icp plasma unless another method is detailed. Na and ba were also analyzed with results below the detection limit. Humidity (dehydration 30âºc) 0, 15% Crystallization water (dehydration 200âºc) 19, 24% So3 43, 94% Co2 (volumetry) 0, 89% Cao 30, 91% Mgo 0, 17% Sro 1, 47% Sio2 2, 32% Fe2o3 (volumetry) 0, 15% Al2o3 0, 69% K2o (flame spectroscophy) 0, 20% Total 100, 13% -