Growth of pyrite whiskers is a special type of crystallization.Three-dimensional microscopic observation was conducted on pyrite whishkers occurring on the different parts of barite crystals from Gengzhuang by using laser microscope.The data indicate that whiskers on different parts of barite crystals vary greatly in size,with lengths ranging usually from 150 μm to 1700 μm and diameter from 3.504 μm to 113.720 μm and the degree of surface undulation changing from 0.349 μm to 35.128 μm.Whisker growth present...