The repeating pattern of a mineral's particles forms a solid called a. . . 

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megamind-616 | Middle School Teacher | (Level 1) Associate Educator

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The repeating pattern of a mineral's particles form a solid called a crystal. The particles of a crystal line up in a pattern that repeats. A crystal has flat sides and sharp edges and corners. 

Crystal formation is one of the criteria that a substance must have for the substance to be classified as a mineral. The other four criteria are listed below:

- Naturally occurring- Minerals must form from processes within nature (as opposed to biological processes). 

- Inorganic- Minerals cannot form from materials that were once living. 

- Solid- The particles of minerals cannot flow freely. 

- Definite chemical composition- This means that a mineral always has certain elements in a specific proportion. 

Additionally, almost all minerals are compounds. Compounds are made of two or more elements that combine in a distinct proportion. 

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