prism crack

prism crack

[′priz·əm ‚krak]
(geology)
A mud crack that develops in regular or irregular polygonal patterns on the surface of drying mud puddles and that breaks the sediment into prisms standing normal to the bedding.
References in periodicals archive ?
The 600MW Prism reactor may be loosely based on the 19MW EBR II, but to claim that "the Prism technology is proven" because an experimental unit 1/30th of the size designed in the 1960s ran successfully is ridiculous ("Has Prism cracked the plutonium problem?" PE August).