Chromite Value, Price, and Jewelry Information


Chromite
Rob Lavinsky, iRocks.com – CC-BY-SA-3.0 [CC-BY-SA-3.0], via Wikimedia Commons

Chromite is shiny and black, and makes a curious-looking cabochon with no special attraction. Occasionally, a cabochon has a reddish color. The stones have little value because the material is extremely abundant but are cut as curiosities only.

Chromite Value

The International Gem Society (IGS) has a list of businesses offering gemstone appraisal services.

Chromite Information

DataValue
NameChromite
Is a Variety ofSpinel
Crystallography Isometric. Octahedral crystals up to I cm on edge; massive.
Colors Black, reddish brown.
Luster Submetallic; opaque, translucent in thin splinters.
Fracture Uneven. Brittle.
Hardness 5.5
Specific Gravity 4.5-4.8
Cleavage None.
Luminescence None
Spectral Not diagnostic
FormulaFeCr2 O4

Chromite group, extensive solid-solution series.

Note: Magnesiochromite = MgCr2 O4; Hercynite = FeAl2O4.

Optics: R.I. = 2.08-2.16. Isotropic.

Occurrence: in igneous rocks rich in olivine; in serpentines; in stream and beach sands. Sometimes in massive deposits of large size.

California; Oregon; Washington; Wyoming; Maryland; North Carolina; Pennsylvania.

Canada; Cuba; Norway; USSR; France; Zimbabwe; India.

Stone Sizes: Any size could be cut from massive material. The possibility exists for some deep reddish crystals to contain very tiny facetable areas, but thus far none have been discovered.

Comments: Chromite is shiny and black, and makes a curious-looking cabochon with no special attraction. Occasionally, a cabochon has a reddish color. The stones have little value because the material is extremely abundant but are cut as curiosities only.

Sometimes weakly magnetic.

Name: In allusion to the composition.