Sphalerite

Field of view: 10 mm. Sphalerite associated with rhodonite. The groups of transparent dark grayish-brown trapezohedrons are sphalerite. The surrounding transparent parts with a vitreous luster are quartz, and the transparent pink parts are rhodonite. The transparent pale brown parts at the upper left are spessartine.

Recovered from a chert-hosted bedded manganese deposit subjected to Hornblende-hornfels facies contact metamorphism by S-type (Ilmenite-series) granodiorite. Formed in the Late Cretaceous (90 Ma).

Sphalerite from this location was described in 1957.