Dumortierite
Unnamed Dumortierite occurrences [1], Ogilby, Imperial County, California, USA
9.1 x 5.4 x 3.2 cm. Dumortierite is an uncommon complex Al borosilicate. All sides of the matrix are richly covered with pretty violet microcrystals. Specimens from this obscure California locale are seldom available. Old-time, rare material from an East Coast collection. It comes with a Hugh Ford label dating from 1946-1957 and an even older ...
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