Woolly erionite from the Reese River deposit, Nevada, is identical in appearance to that at the type locality, near Durkee, Oregon. Both of these erionites differ in appearance from all other erionite reported in the past 20 yr from diverse rocks throughout the world which are described as prismatic or acicular in habit. The Reese River woolly erionite fills joints in gray to brownish-gray lacustrine mudstone of probably Pliocene age, in a zone about 1m thick beneath a erionite febres gray vitric tuff. Compact masses of long, curly, woolly Z are in the plane of the joint and locally are associated with opal. A chemical analysis of wooly erionite yields a unit-cell composition of: Na1.01K2.84Mg0.3Ca1.69Al8.18Si27.84O72.28.51H2O. -from Authors
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Woolly erionite from the Reese River zeolite deposit, Lander County, Nevada, and its relationship to other erionites.