* Gypsum: This is a very common mineral, often found in sedimentary rocks. It's also used to make drywall.
* Talc: The softest mineral on the Mohs scale. It's often used in baby powder and cosmetics.
* Selenite: A variety of gypsum that is known for its clear, glassy appearance.
There are other minerals with a hardness of 2, but these are some of the most common and well-known.
