Linked from
The 23 pages that link to Chromium, each with the reason it gives.
CorundumRelated: Small amounts of chromium give ruby its characteristic red color.
VanadiumRelated: Chromium lies beside vanadium in the periodic table and also strengthens steel.
SapphireRelated: Chromium produces the red color of ruby, the red variety of corundum.
ChromiteRelated: Chromite is the main natural source of this element.
SpinelRelated: Chromium impurities create the red color of many gem spinels.
Spinel groupRelated: Chromite supplies most of the chromium extracted for industry.