Chert, flint and jasper are opaque forms of ultrafine-grained quartz. Jasper is distinctively red or multicoloured. Flint is a hard variety of chert, often found as nodules in limestone.
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Te Ara - The Encyclopedia of New Zealand
Photograph by Alastair McLean
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Quartz (SiO2 - silica) can be
John Sherwin (not verified)
21 December 2022
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