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3DFerrochrome crystal.
Ferrochrome is an alloy (mixture) of iron and chromium. It is a common intermediate material between chromium ore and finished products involving iron and chromium, such as the common high strength chrome-vanadium steel. I believe that it is simple cheaper and easier to ship ferrochrome to customers rather than try to refine pure chromium, which would just end up getting mixed with iron again anyway: No sense spending a lot of time and money purifying something that isn't going to be used in pure form anyway.
This is a very lovely crystal, heavy and mineral-like, though it is an artificial product.
Source: eBay seller valdor
Contributor: Theodore Gray
Acquired: 3 June, 2003
Price: $10
Size: 2.5"
Composition: FeCr