Cockercombe Tuff is a greenish-grey, hard pyroclastic rock, formed by the compression of

volcanic ash Volcanic ash consists of fragments of rock, mineral crystals, and volcanic glass, produced during volcanic eruptions and measuring less than 2 mm (0.079 inches) in diameter. The term volcanic ash is also often loosely used to r ...

containing high quantities of

chlorite The chlorite ion, or chlorine dioxide anion, is the halite (oxyanion), halite with the chemical formula of . A chlorite (compound) is a compound that contains this group, with chlorine in the oxidation state of +3. Chlorites are also known as s ...

, which gives it its distinctive colour. It is found almost exclusively in the south-eastern end of the

Quantock Hills The Quantock Hills west of Bridgwater in Somerset, England, consist of heathland, oak woodlands, ancient parklands and agricultural land. They were England's first Area of Outstanding Natural Beauty, designated in 1956. Natural England have desi ...

near Cockercombe,

Somerset Somerset ( , ), Archaism, archaically Somersetshire ( , , ) is a Ceremonial counties of England, ceremonial county in South West England. It is bordered by the Bristol Channel, Gloucestershire, and Bristol to the north, Wiltshire to the east ...

, England, from where it has been quarried for centuries. Quantock Lodge is built from Cockercombe tuff.

References

Tuff Building stone Geology of Somerset Volcanism of England Quantock Hills {{Somerset-geo-stub