Quartz and its less common polymorphs are among the most comprehensively studied of earth materials. But even here there are unresolved questions One such is the enigmatic problem of agate genesis. Agate is popular with collectors and finds extensive use in jewellery, carvings and objet's d'art. To anyone with a scintilla of scientific curiosity, a polished agate slice raises questions. How old is it? How did it form? Why is it banded? Terry Moxon, a retired schoolteacher from South Yorkshire, has studied agate for more than thirty-five years and has produced a volume that answers some of those questions....

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