crystal-vitric tuff

crystal-vitric tuff

[¦krist·əl ¦vi·trik ′təf]
(geology)
Consolidated volcanic ash composed of 50-75% crystal fragments and 25-50% glass fragments.
References in periodicals archive ?
These rocks were classified as alkaline rhyolites crystal-vitric tuffs, with aligned sanidine, anorthoclase, hastingsite and sphene crystals in a glassy matrix (Pardo, 2004).