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chalker wrote: The national tests are always available the next year in the test packets sold online at the official SO store (soinc.org)

Would it be possible for the samples used at nationals be posted online/in the packet next year? (since that hasn't usually been in the packet in the past...)

Has anyone ever had a question that asked where specific rocks or minerals could be found in the world? Just wondering in case I should know. Not in that exact wording, no. Mainly, I think, because there are many places to find minerals, and many minerals can be found in multiple locations. However...

If this is correct, melissay63 may go as I probably would not have guessed albite.

correct!

Allinea was just explaining why the sphalerite was sphalerite and not citrine as darkdeserthighway was confused.

I have not and I doubt it will ever be asked because "the conditions of the test used to obtain the number must be specified" and that would create some variance and ultimately be harder to grade for the proctor.

Sorry for the double post!

Do you know what would cause the tint/color change? It also doesn't look as conchoidal as obsidian usually does, so how would you ID this?