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The Mineral magnesiochromite

Magnesiochromite with Clinochlore

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

Color

Black to brownish-black

Crystal System

Isometric

Properties

Streak
Dark gray
Hardness
5.5
Transparency
Opaque
Specific Gravity
4.2
Luster
Metallic to dull
Cleavage
None
Fracture
Conchoidal to uneven
Tenacity
Brittle

Crystal Habits

Crystals, which are octahedral, are very rare. Usually grainy, massive, and as rounded embedded masses.

3D Crystal Atlas

Additional Information

Composition
Magnesium chromium oxide, often with some iron.
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

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

Distingushing Similar Minerals

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

magnesiochromite Photos



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