USGS CMG InfoBank: Minerals Formed By Biologic Processes

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Comment: 24:25 - 24:45 (00:20)
Source: Annenberg/CPB Resources - Earth Revealed - 12. Minerals: The Materials of Earth
Keywords: mineral, "biological activity", oyster, pearl, sponge, coral, "calcium carbonate", "sea water", precipitation, calcite, aragonite

Our transcription: Minerals also form by biologic processes as when an oyster makes a pearl.
In addition, sponges and corals make their shells out of calcium carbonate taken from seawater and precipitated as the minerals calcite or aragonite.

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