Creestal habit

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Pyrite sun (or dollar) in laminatit shale matrix. Atween tichtly spaced layers o shale, the aggregate wis forced tae grow in a laterally compressed, radiatin manner. Unner normal condeetions, pyrite would form cubes or pyritohedrons.

In mineralogy, creestal habit is the chairacteristic freemit shape o an indiveedual creestal or creestal group.