I can't find a picture to build a model of calcium sulphate using styrofoam ball pls help

http://www.google.com/search?q=model+of+calcium+sulphate&hl=en&tbm=isch&tbo=u&source=univ&sa=X&ei=wmNYUZrtLOXLyAGT-YHYAg&ved=0CC0QsAQ&biw=711&bih=453