Limbergite. Limberg, Germany.

This is a thin section microscope slide of a very rare volcanic rock, Limbergite. From the carbonatite volcanic complex at Kaiserstuhl, in southern Germany. An interesting brown matrix contains titaniferous augite with the usual zoning and magnificent interference colours, olivine with altered rims and fresh centres, some crystals embayed. Outstanding amygdules, filled with zeolites, often different types, sometimes including an unidentified red one.

1 Slide

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