Chromite

Chromite

Chemical Formula:  FeCr2O4

Chemical Composition:  Iron chromium oxide

Crystal System:  Cubic (Isometeric)

Mineral Group:  Spinel

Mineral Class:  Oxides and hydroxides

Hardness:  5.5

Density/Specific Gravity:  4.5 — 4.8

Refractive Index:  2.1

Double Refraction:  None

Colour:  Yellow, orange, brown

Pleochroism:  None

Transparency:  Transparent, translucent, opaque

Lustre:  Metallic, submetallic 

Luminescence: None

Cleavage:  None

Fracture:  Conchoidal, uneven 

Countries:  Largest mine is in South Africa. Other locations include Canada, Pakistan, Philippines, Russia, USA, Zimbabwe

Notes:  Weak magnetic properties

Chromite

Wikimedia Commons / Rob Lavinsky 

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