layered geological column featuring gold quartz and sapphire sections cross cut rock sample educational layout |
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| navigate by keyword : geology column layered gold quartz sapphire crosscut rock sample educational formation strata minerals texture structure sediment stone crystal metallic natural earth science mineralogy detail sedimentary metamorphic core slice composition raw element colorful polished teaching study research display academic diagram stratigraphy visual material closeup specimen underground learning |
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| Layered geological column featuring gold, quartz, and sapphire sections in cross-cut rock sample, educational layout. |
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