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Re: Osumilite in Thin section
Dear Thomas,
Ossumilite in high grade rocks (eg Norway) is quite difficult to distinguish from perthitic fsp. It devellops spindle like textures that are quite typical.

See a for optical properties

Armbruster, Th. and Oberhänsli, R. (1988): Crystal Chemistry of Double Ring Silicates:Structural, Chemical and Optical Variation in Osumilites. -  Am. Miner. 73, 585-594.

Roli Oberhaensli
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