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I challenge you!


Asperion

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... you left out "Primitive".

 

But of the three that you find in bulk here on Earth, ... dunno.  Gabbro or schist?

 

I guess I'll go for what I'm used to seeing (to the exclusion of all else) in eastern WA, igneous.  The Columbia basalt deposits are ... remarkable.  

 

Gah, ninja'ed by Bazza.  To him I'll say ... emerald.

 

 

Geologically important gemstones:

 

Zircon, or olivine (well, peridot when in gem form)

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