Zeophyllite is a secondary mineral formed by hydrothermal alteration of basalt. It is a basic silicate and fluoride of calcium (Ca4Si3O7(OH)4F2) that may contain iron. Crystal system is trigonal-rhombohedral and often occurs as pearly white radially crystalline spheroids inside voids in basalt, as seen in this sample from Litomerice in Bohemia, Czech Republic.

px px dpi = cm x cm = MB
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