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The development of an individual crystal, or aggregate of crystals, to produce a particular external shape, with development depending on the conditions obtaining during formation. Individual crystals may possess habits such as acicular (needle-like), tabular (broad and flat), fibrous (hair-like), or prismatic (elongated in one direction). Aggregates of crystals may possess habits such as botryoidal, dendritic, or reniform (kidney-shaped).

Subjects: Earth Sciences and Geography.

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