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Leopardite Stone

Leopardite is a widely recognized rock name that was introduced into the geological literature in the mid 1800s.  Various descriptions of this rock in the literature can be summarized as follows:  off-white, fine-grained aplite (or alaskite), with  sporadic quartz phenocrysts, that is characterized by dark gray to black or brownish, roughly rod-shaped zones pigmented by hydroxides of manganese (plus or minus iron).