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Mineral oil is not a mineral; it is a byproduct of the distillation of petroleum. It is a colorless and odorless oil that is commonly used in cosmetics, medications, and other household products.
When a mineral can scratch another mineral, it means that the mineral is harder than the mineral it can scratch. Hardness is a measure of a mineral's resistance to being scratched, with the Mohs scale commonly used to rank minerals based on their hardness.
Talc is the most common mineral used in baby powder because of its softness and ability to absorb moisture.
Graphite is the mineral used in pencils. It is a form of carbon that allows for smooth writing and drawing.