Exactly what the person above said!
Pyrite, Wulfenite, Pyromorphite, Topaz, Gypsum, and Feldspar.
Answer:
Because each duplicated chromosome consists of two identical sister chromatids joined at a point called the centromere, these structures now appear as X-shaped bodies when viewed under a microscope. Several DNA binding proteins catalyze the condensation process, including cohesin and condensin.
Explanation: