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Glittery, flashing specks in rocks that catch your eye are most likely either biotite or muscovite mica. Their crystal faces have a very glassy texture.

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What are terms used to describe rocks with large vs small particles?

Rocks with large particles are called coarse-grained rocks, while rocks with small particles are referred to as fine-grained rocks. The term grain size refers to the size of the individual particles within a rock.


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Rocks such as sandstone are formed from particles of other rocks are?

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Particles of sediments can originate from various types of rocks, primarily including igneous, sedimentary, and metamorphic rocks. When these rocks undergo weathering and erosion, they break down into smaller particles such as sand, silt, and clay. These sediment particles can then be transported and deposited in new locations, eventually forming sedimentary rocks through lithification.


Were there blood particles on the rocks that NASA's astronauts brought back from the moon?

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