Explain what determines the shape of a mineral crystal?

Explanation:

Crystallized matter is based on a periodic arrangement of the atoms which is defined by the translation lattice. ... The properties of a mineral are determined by the kind and geometrical arrangement of atoms or molecules within the crystal structure.

The shapes of crystals are determined by a number of factors such as the size and length of their surfaces (known as 'faces') and edges, as well as the angles between these. These shapes are named after their geometry - for example, crystals based on cubes belong to the 'cubic or isometric' crystal group

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