No. Although identifying the minerals in a rock is a chemical issue that could be done using chemical tests, rocks and minerals are not living things so the biochemist wouldn't be the right person to consult. Instead, the geologist should consult with an inorganic chemist.
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Identifying minerals in a rock has to do with chemistry; however an inorganic chemist would be better to consult with than a biochemist as a biochemist deals with living things.