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Is it a pure substance or a mixture?

I have three things and I need some help classifying them. I think they are all pure substances.Diamond? Milk? And, copper metal?

diamond is a substance based off of coal so it is a pure substance, milk is not a pure substance it it contains alot of differnt elements and materials,and copper is a pure substance as its a natural mineral


Diamond is pure, copper metal is pure while milk is not pure.


Diamond is made of only the element carbon.
Copper is also an element.
Milk has water, many proteins, and a mixture of who-knows-what.

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