Rhyolite has a composition similar to granite but has a much smaller grain size. It is composed of the light-colored silicates and is usually buff to pink in color. Occasionally it is light gray. In texture it is classified as aphanitic. It frequently contains voids and glassy fragments, evidence of having formed in a surface environment with rapid cooling.

Stob Dearg

HeightGrid Ref.PronunciationMeaning
1021 metres / 3350 feetNN222542Stob JerrackRed peak (Big shepherd of [Glen] Etive)

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