Prehnite Sgurr nan Cearcall, nr Glen Brittle, Isle of Skye, ...
Description: Prehnite Sgurr nan Cearcall, nr Glen Brittle, Isle of Skye, Scotland, UK 6cm x 4cm x 5cm deep 'Stalactitic' formation of white prehnite on very hard basalt. The prehnite has most likely replaced some thin crystals of another, probably zeolitic mineral like laumontite. Self-collected 1997