Type in as many kinds of rocks and minerals as you can think of. Included are common stones as well as man-made rock material. Valuable gems and jewels included. To round out the list there are about 10 or 12 fictional rocks, gems or stones
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This was the most arbitrary quiz I've ever seen. I listed about 200 common gems and minerals that were arbitrarily not included in the list. This is purely a guessing game.
Though arbitrary to you it should be general to the public. What common minerals and gems did you type in that were not included? I would guess they aren't well known or they wouldn't be in this quiz.