Pitchstone monadnock

pitchstone inselberg sgurr geology

A spectacular pitchstone ridge on the Isle of Eigg Scotland, rises out of the surrounding small islands landscape. Sgurr, which means The Notch, has sheer cliffs and is 400 meters (1300 feet) high. The island mountain Sgurr of Eigg in geology is known as a monadnock in the USA, inselberg in Europe or a koppie …

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What is pitchstone?

pitchstone obsidian arran

What is pitchstone? How is pitchstone formed? Is pitchstone just a special variation of volcanic glass? A form of obsidian rock created in high water conditions such as underwater in the sea? Is pitchstone from the same source as lava rock around it but it has been transformed or transmuted by another process leaving or …

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Specimen Mountain and pitchstone

pitchstone 7 specimen mountain never summer range volcanic glass

Pitchstone, a special and rarer type of volcanic glass that is high in water content, is found on the Isle of Arran, Scotland and also on the slopes of Specimen Mountain in the Rocky Mountains in Colorado. Specimen Mountain, in the fantastically named Never Summer Range, and the Scottish Isle of Arran also have numerous …

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Isle of Pitchstone


Pitchstone rock is a variation of natural glass and similar to obsidian. Pitchstone seems to be a rare beastie found in a couple of places in Scotland, one of those is the Isle of Arran. This natural glass rock is called Pitchstone or Pechstein in German, as it resembles pitch that makes it look differently …

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