Mylonitized manganiferous schists and calc-silicate layers intercalated within amphibolite-to greenschist facies mica schists from the Trikorfo area (Thassos Island, Greece), host an unusual Mn-rich paragenesis of metamorphic silicate minerals, most of them in large, gemmy crystals. The silicates occur both in layers subparallel to the foliation and within discordant veins cross-cutting the metamorphic fabric. Piemontite (up to 12.7 wt. % Mn2O3), , , , spessartine (up to 47.7 wt. % MnO) and

Mantle xenolith samples in contact with

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