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A rock looks like a mixture, but air does not. Heterogeneous Mixtures A heterogeneous mixture is a mixture in which substances are not evenly mixed. For example, granite is a heterogeneous mixture. The substances that make up granite are unevenly mixed. When you look at a piece of granite, you can easily see the different parts.
Pure Substances and Mixtures â¢ A pure substance is a type of matter that contains only one kind of particle. For example, aluminum, table sugar, and distilled water are pure substances. â¢ A mixture is a type of matter that contains two or more pure substances mixed together. For example, steel, salt water, milk, and air are mixtures. â¢ Mixtures can be solids, liquids, or gases, or even combinations of these.