Abstract

Sarcopside occurs as crosscutting sets of laths, oriented approximately parallel to {112} of triphylite at the Bull Moose Quarry, Custer, South Dakota. The textural relations indicate an origin through exsolution and in this respect the material is similar to graftonite-sarcopside and graftonite-triphylite intergrowths. Graftonite-sarcopside intergrowths are also found at the Bull Moose Quarry, as well as specimens showing the expected coexistence of all three phases.

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