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Pl help me to identify these rock No 1&2 non magnetic. Give brown poweder when grind and metallic shine not hematite

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asked Feb 12 by santoshmlokhande (580 points)
edited Feb 12 by santoshmlokhande

1 Answer

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I'd say the bottom two are pictures of opal.

The other may be aquamarine.
answered Feb 13 by Weasel (32,670 points)