Fluorescent hydrogrossular is reported from a vesuvianite-bearing marble from near Mosj0en, North Norway, and the modes of occurrence of the mineral are described. In the same rock non-fluoreseent grossular is present in the narrow contact zone of two monzonitic dikes. The hydrogrossular formed during the second of two main crystallization episodes, probably by metasomatism associated with intrusion of monzonite. Possible factors contributing to fluorescence in garnets are briefly considered.

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