Usually pink and white stripes. The specimen on the right is rhodochrosite crystals.
Rhodochrosite is sometimes used as jewelry. It is similar to Rhodonite. You can tell the difference between them as Rhodonite is darker pink, and can have black bits in, while Rhodochrosite is pale pink, with white bits in.
Larger pictures of Rhodochrosite:
This surface is cut and polished to show the pink and white layers typical of Rhodochrosite.
This specimen has been polished (tumbled).
This is natural. There are small pink crystals of Rhodochrosite.
