Unusual fortification Agate
Location: Isle of Mull, Argyll and Bute, Scotland, UK
Dimensions approx.: mm
Weight:  grams
Polished half
This specimen glows in UV light
Visible cracks are filled with second generation silica
 
Mull agates are generally rather small, ranging from about 30 to 50mm in most cases, although larger examples do occur. A large majority comprises clear and banded chalcedony, and these frequently possess the most exquisite patterns. The agates found here are usually uncracked and show no colour apart from some with a pale honey tint.