Uralite

Uralite, a peculiar variety of hornblende, resulting from the alteration of augite crystals. The apparent form of the crystal is thus identical with that of augite, but the mass really consists, not of this substance, but of a great number of minute hornblende crystals. It derives its name from the localities where it was first found, though it has since been seen to be tolerably widely distributed in igneous rocks.