macedonite

a. A tetragonal mineral, PbTiO₃ ; black; in irregular grains in quartz-syenite veins near Prilep, Macedonia. b. A bluish-black aphanitic igneous rock composed of alkali feldspars and biopyriboles; related to mugearite, a trachyandesite, Macedon district, Victoria, Australia. The name is not part of the IUGS classification of extrusive igneous rocks.
Source: Dictionary of Mining, Mineral, and Related Terms

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