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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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