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CHALK #1 (detail)
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     A biochemical rock composed of the microscopic tests (skeletons) of single celled organisms belonging to the phylum Haptophyta; common name coccoliths or coccolithophorids.
      In this close-up we see no more than in the full specimen. Even under a laboratory microscope we would not see much more. It takes a scanning electron microscope to see the coccolith skeletons.
     Soft, white, powdery, gritty rock that easily rubs off on you fingers. Reacts with dilute HCl producing large, foaming bubbles.

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Last Update: 7/18/00

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