Ferberite?

Field of view: 1 mm. Black tabular ferberite(?) in calcite. The white parts in the host are calcite, and the massive yellow parts are pyrite.

Recovered from a moderately low-temperature hydrothermal deposit combined with skarn formed by contact metamorphism of I-type (magnetite-series) quartz diorite. Formed in the late Miocene (6 Ma).