Difference between revisions of "Black chalk"

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(Created page with "A bluish-black carbonaceous clay, shale, or slate, used as a pigment or crayon. <I>AGI </I> Source: Dictionary of Mining, Mineral, and Related Terms")
 
 
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Source: Dictionary of Mining, Mineral, and Related Terms
 
Source: Dictionary of Mining, Mineral, and Related Terms
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[[Category: Geology]]

Latest revision as of 11:05, 25 June 2021

A bluish-black carbonaceous clay, shale, or slate, used as a pigment or crayon. AGI

Source: Dictionary of Mining, Mineral, and Related Terms


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