Pureness is in the eye of the beholder. But monocrystaline minerals could be considered "pure" as could anything consisting of just one element or one compound.
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pure substance, propanone
A pure substance is classified by having a definite and constant composition. The substance can be either an element or a compound, but what makes the substance pure, is that it does not vary.
A pure substance is something that is only composed of one component. So, everything in the periodic table as well as every single molecule can be considered a pure substance. For example, a block of sulfur is a pure substance because it's made entirely out of sulfur. Another example would be a cup of pure acetone because there is only acetone inside the cup. So, salt water is not a pure substance because it's water mixed with salt.
it s pure liquid.
Pure Iron is considered as Homogeneous. Whereas, Iron with rust or other impurities is Heterogeneous.