Abstract
Coesite has recently been described as a primary phase in a mantle-derived kyanite eclogite from the Roberts-Victor kimberlite, South Africa. An additional specimen from the same locality contains large polycrystalline aggregates of quartz, resembling the quartz rims on the coesite grains in the first specimen. The characteristic textures of these quartz pseudomorphs after coesite are described to aid in the identification of further specimens.
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