Brisbane tuff is a type of rock,[1] formed as a result of a volcanic eruption. As the name suggests, it is a type of tuff found in Brisbane, Queensland, Australia.[2] It is a form of welded ignimbrite.[3] Brisbane tuff comes in a variety of colours: pink, green, blue-grey, yellow and purple.[4] The different colours are due to the extent of oxidation of iron and manganese.[5]
It is often incorrectly described as porphyry.[5]
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