Fine rhombic dodecahedra occur in the schistose rocks of the Zillertal, in Tyrol, and are sometimes cut and polished.
2.
It occurs in marble and schistose rocks of Prince of Wales Island in Alaska, here as large, dark green, tabular crystals with copper ores in metamorphosed limestone.
3.
The term was originally applied in Itabirito ( Pico de Itabirito ), in the state of Minas Gerais and southern part of Belo Horizonte, Brazil, to a high-grade, massive specular hematite ore ( 66 % iron ) associated with a schistose rock composed of granular quartz and scaly hematite.
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