1) Volcanic rock
Found on
https://www.crosswordclues.com/clue/pantellerite
Pantellerite is a peralkaline rhyolite. It has a higher iron and lower aluminium composition than comendite. It is named after Pantelleria, a volcanic island in the Strait of Sicily and the type location for this rock. On Pantelleria the rock is usually found as a vitrophyre containing phenocrysts of anorthoclase or sanidine. Quartz is found only ...
Found on
http://en.wikipedia.org/wiki/Pantellerite
(from the article `rhyolite`) ...or alkali amphibole is the principal dark mineral, oligoclase will be rare or absent, and the feldspar phenocrysts will consist largely or ...
Found on
http://www.britannica.com/eb/a-z/p/13
No exact match found.
