reticulite

GLOSSARY OF VOLCANIC TERMS
An exceptionally porous type of scoria containing porosities ranging from 95-99% (Vergniolle and Mangan, 2000, p. 447; McPhie et al., 1993, p. 27). Commonly referred to as "thread-lace" scoria, reticulite is made up of a honeycomb-like network of thin glass fibers.
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USGS PHOTO GLOSSARY OF VOLCANIC TERMS
Reticulite is basaltic pumice in which nearly all cell walls of gas bubbles have burst, leaving a honeycomb-like structure. Even though it is less dense than pumice, reticulite does not float in water because of the open network of bubbles. The delicate glass threads between the bubbles are so fragile that reticulite was first called "thread-lace scoria" by the great American mineralogist, James Dana. It has also been called limu.
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Photograph by J.D. Griggs.
Reticulite erupted from Kilauea Volcano, Hawai`i.

Glossary of volcanic terms. - University of Wisconsin Oshkosh. . 2001.

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