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PORPHYRY (cut and polished cobble) - Montrose, Scotland

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Home > MINERALS > UNUSUAL ROCKS AND MINERALS - WEIRD AND WONDERFUL !
  
PORPHYRY

Cut and polished cobble
  
Lunan Bay, near Montrose, Scotland
  
Rocks with large crystals in a fine-grained groundmass are described as having a ‘porphyritic’ texture.
  
This is a lovely little cut and polished water-worn beach cobble of andesite lava with large feldspar crystals in a dark matrix. These lava flows also contain beautiful agates, for which this part of the coastline is famous.
   
Click on a picture for a larger image

Size:  8.5 x 6.5 x 2 centimetres
Weight:  200 grams

PRICE: £22.00
PORPHYRY (cut and polished cobble) -  Montrose, Scotland
PORPHYRY (cut and polished cobble) -  Montrose, Scotland PORPHYRY (cut and polished cobble) -  Montrose, Scotland PORPHYRY (cut and polished cobble) -  Montrose, Scotland PORPHYRY (cut and polished cobble) -  Montrose, Scotland