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210516B

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Image #   210516B
Name:   Chalk dust
Copyright:   Copyright 2010 Dennis Kunkel Microscopy, Inc.
Description:   Caption: Chalk dust (anti-dust type) from a school chalk board / eraser. Chalk (also known as calcite) is a white, porous sedimentary rock. It is a form of limestone that is chemically called calcium carbonate (CaCO3). Limestone forms in deep marine environments from the slow accumulation of very small calcite plates (coccoliths) produced by certain types of microorganisms called coccolithophorids. The famous White Cliffs of Dover are an example of a natural limestone deposit.
Magnification*: x2,135
Type: SEM
    *(Magnifications are based on a 35mm slide image of 24mm in the narrow dimension.)
Keywords:   10.01.10 210516B chalk chalk board chalk board dust chalk dust chalkboard chalkboard dust eraser dust man made manmade school eraser dust CaCO3 Cliffs of Dover White Cliffs of Dover calcite calcite plates calcite scales calcium carbonate coccolithophorid coccolithophorids limestone sedimentary rock sedimentary rocks airborne particle airborne particles chalk airborne particle chalk airborne particles airborne particulate airborne particulates particulate particulates board chalk chalkboard chalk play chalk school chalk

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