Manganochromite

manganochromite

pyrrhotite

rutile

diopside

Images

Formula: Mn2+Cr2O4
Oxide of manganese and chromium, spinel subgroup, oxyspinel group, spinel supergroup, forms a series with vuorelainenite
Crystal System: Isometric
Specific gravity: 4.88 calculated
Hardness: 5½
Colour: Brownish grey
Environments

Metamorphic environments
Meteorites

Localities

The type locality, the Shepherd Hill Quarry, Rutile occurrence, Nairne, Mount Barker, District Council of Mount Barker, South Australia, has several unusual occurrences, including alabandite, graphite and native nickel, suggestive of highly reducing conditions. The complex mineralogy of this sedimentary deposit is a result of a high-grade metamorphism and subsequent slight alteration.
ln one polished section from the edge of a tension gash vein, several euhedral grains of manganochromite are present near the interface between massive pyrrhotite and gangue. Some are elongated, ranging in size from about 10 µm across to about 80 µm x 800 µm. (AM 63.1166-1174).
Associated minerals include pyrrhotite, rutile and diopside (HOM).

At the Burkhala meteorite, Susumansky Urban District, Magadan Oblast, Russia, manganochromite occurs in sulphide nodules in the iron meteorite. Associated minerals include troilite, daubréelite, alabandite, zinc sulfides, olivine and pyroxene (HOM).

At the Sätra Mine, Doverstorp ore field, Finspång, Östergötland County, Sweden, manganochromite occurs in a metamorphosed iron sulphide deposit associated with submarine felsic volcanism. Associated minerals include vuorelainenite, sphalerite and alabandite (HOM).
Manganochromite from the Sätra Mine - Image

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