noun
: a mineral consisting of agate containing brown, black, or green mosslike or dendritic markings due in part to oxide of manganese — called also Mocha stone
noun
: a mineral consisting of agate containing brown, black, or green mosslike or dendritic markings due in part to oxide of manganese — called also Mocha stone
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012