Lithographic limestone is hard limestone that is sufficiently fine-grained, homogeneous and defect free to be used for lithography. Geologists use the term lithographic texture to refer to a grain size under 1/250 mm. The term sublithographic is sometimes used for homogeneous fine-grained limestone with a somewhat coarser texture. ==Origin== The g...
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http://en.wikipedia.org/wiki/Lithographic_limestone
Lithographic limestone is a compact, fine-grained limestone, obtained largely from the Lias and Oolite, especially of Bavaria, and extensively used in lithography.
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http://www.probertencyclopaedia.com/browse/HL.HTM
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