AGRELLITE NaCa2Si4O10F Triclinic

Description: Agrellite is a very rare mineral found in mafic, sodium-rich and silicon-poor igneous and metamorphic rocks.

MARATHON COUNTY: Agrellite is found as light-gray prisms as much as 1 cm. in maximum dimension in a leucocratic dike from an unspecified locality in Marathon County (Medaris and Guggentine, 1983) This is only the second known occurrence in the world of this mineral.

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