Close-up of the texture of giant erratic No 5. From a distance the colour appears greenish-blue.
Close-up of the texture of giant erratic No 3. This one has a more distinct green colouring.
Would anybody like to hazard a guess at the rock type? Is this what we would call a quartz-porphyry, or two of them? Or has it got a different name nowadays? Rhyolite with feldspar phenocrysts?
No comments:
Post a Comment