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Occurrences and origin of the hourglass structure


, : Occurrences and origin of the hourglass structure. Report of the

A number of minerals other than chloritoid and diopside show hourglass structure. Data on crystal growth indicate that examples of hourglass structure among rock constituents are more common than has generally been recognized, that other growth patterns may have a similar origin, and that some high-temperature crystals showing hourglass structure may perhaps be grown artificially Ten theories concerning the origin of hourglass structure are summarized.

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