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Magnesiochromite with Clinochlore

The Mineral magnesiochromite




Magnesiochromite is very similar to Chromite, and is often mistaken for it. Due to their similarity, it is very difficult to visually distinguish these two minerals. Magnesiochromite is the magnesium-dominating form in a series with Chromite, whereas Chromite is iron-dominating.
Chemical Formula MgCr2O4
Composition Magnesium chromium oxide, often with some iron.
Variable Formula (Mg,Fe)Cr2O4
Color Black to brownish-black
Streak Dark gray
Hardness 5.5
Crystal System Isometric
3D Crystal Atlas
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Crystal Forms
and Aggregates
Crystals, which are octahedral, are very rare. Usually grainy, massive, and as rounded embedded masses.
Transparency Opaque
Specific Gravity 4.2
Luster Metallic to dull
Cleavage None
Fracture Conchoidal to uneven
Tenacity Brittle
In Group Oxides; Multiple Oxides
Striking Features Streak and hardness
Environment In Serpentine deposits, as well as in ultrabasic igneous rocks. May also be in placer deposits.
Rock Type Igneous, Metamorphic
Popularity (1-4) 3
Prevalence (1-3) 3
Demand (1-3) 3


Magnesiochromite ON EBAY
OTHER NAMES
Picrochromite




NOTEWORTHY LOCALITIES
Magnesiochromite does not have well defined localities, as it occurs scattered in chrome deposits together with Chromite. The type locality for this mineral is Schwarzenberg, in the Erzgebirge, Saxony, Germany. Other occurrences are the Saranovskoye Mine, Sarany, Ural Mountains, Russia; Soldiers Delight, Owings Mill, Baltimore Co., Maryland; and the Cedar Mountain Ridge Chromite deposit, near Livermore, Alameda Co., California.

COMMON MINERAL ASSOCIATIONS
Chromite, Serpentine, Clinochlore, Magnetite, Uvarovite

DISTINGUISHING SIMILAR MINERALS
Chromite - Has a brownish streak, is slightly attracted to magnetic fields.


magnesiochromite PHOTOS
 
ADDITIONAL RESOURCES
 
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