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Our transcription: Geologists in the field use simple tests like these to help identify minerals in rocks, but this is only the first step. Some minerals are only present as microscopic crystals in rocks. Others, in only extremely small quantities, and some materials can't be identified by physical properties alone. Petrologists, the geologists that study the composition and origin of different types of rocks need to know much more about a rock sample like this and the minerals it contains. Once a sample is collected and identified in the field, it's taken back to the laboratory for a much more thorough analysis of the minerals.
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