FMF Minerals Gallery

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Cowlesite
Oisgill Bay, Isle of Skye, Scotland, UK
Grey balls of cowlesite to <1mm on 25 mm x 10 mm gas pocket in the basalt

Cowlesite. A gas pocket in the basalt lava (25mm x 10mm) hosts an aggregate of grey balls of cowlesite (to <1mm). It looks very similar to the more common thomsonite but it forms much smaller balls; and tends to occur with other rarer zeolites such as levyne phillipsite, garronite. Self-collected in 1999 from Oisgill Bay, Isle of Skye. (Author: Mike Wood)