Polycrystalline materials are solids that are composed of many crystallites of varying size and orientation. The variation in direction can be random (called random texture) or directed, possibly due to growth and processing conditions. Fiber texture is an example of the latter. Almost all common metals, and many ceramics are polycrystalline. Some...
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http://en.wikipedia.org/wiki/Polycrystal
any solid object composed of randomly oriented crystalline regions, called crystallites, especially as distinguished from a single crystal (q.v.). ... [2 related articles]
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http://www.britannica.com/eb/a-z/p/89
A snowflake composed of many individual ice crystals.
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http://www.encyclo.co.uk/local/22268
a snowflake composed of many individual ice crystals.
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https://nsidc.org/cryosphere/glossary?page=19
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