Crystal Growth from Solutions

Authier, A.; Robert, M.C.; Wallrafen, F.

doi:10.1007/978-3-642-46613-7_12

Cited by 33 publications

References 98 publications

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Morphological instabilities during rapid growth of metamorphic garnets

Jamtveit

Andersen

1992

Phys Chem Minerals

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Abstract. Hydrothermal grossular-andradite garnets from contact aureoles in the Oslo region show morphological transitions from planar via cellular to hopper-like structures. Dodecahedral surfaces {110} dominate during the planar growth stage, whereas the stable crystal faces, developed during the cellular and hopper stages also includes the ikositetrahedron {211} and possibly the hexoctahedron {321}. Faceted cells develope when initially 'wavy' perturbations on the dodecahedral surfaces become tangential to lower-index planar surfaces.Inclusion patterns and morphologies of almandinerich garnets from Mageroy (northernmost Norway) that formed during a period of rapid heating, suggest an early stage of cellular growth followed by planar growth. The morphological transitions suggest that the hydrothermal garnets experienced an increase in the overstepping of the garnet precipitation reaction at some stage during their growth whereas the opposite was the case during growth of the Mageroy garnets. The present observations put constraints on the garnet growth rates and emphasize the importance of growth kinetics during metamorphic processes.

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