Elements:
* Phosphorus: White phosphorus is a soft, waxy, white solid. It is highly reactive and flammable.
* Sulfur: Sulfur can exist in different forms, including a powdery, yellow form and a crystalline, white form. While not as soft as phosphorus, it can be brittle and break easily.
Compounds:
* Sodium chloride (salt): A common, white, crystalline compound that is both soft and brittle.
* Calcium carbonate (chalk, limestone): Found naturally, often in white, chalky form. It's not as soft as salt but can be easily scratched.
* Magnesium oxide (magnesia): A white powder, often used in medicine and cosmetics. It is soft and powdery.
Other possibilities:
* Paper: A common, white material made from wood pulp, although it's not an element or a single compound.
* Styrofoam: A white, lightweight plastic that is soft and flexible.
To give a more precise answer, could you provide more context?
For example:
* What is the material used for?
* What is its texture like?
* Does it have a particular chemical formula?
