Why is all gypsum mined not white?

Gypsum can vary in color due to the presence of impurities and different mineral compositions. Iron oxide, for example, can give gypsum a reddish or yellowish hue, while organic materials may impart brown or black shades. Additionally, the conditions under which gypsum forms can influence its coloration, leading to a range of hues beyond the typical white. As a result, mined gypsum can exhibit various colors depending on its geological environment.