porcelain jasper


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porcelain jasper

[′pȯr·slən ′jas·pər]
(geology)
A hard, naturally baked, impure clay (or porcellanite) which because of its red color had long been considered a variety of jasper.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.