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Agate frequently frames a quartz-filled void, but here this is reversed. The whole slice consists of a very narrow band of agate framing a large area of quartz at the centre of which is this exquisite formation, seen in more detail in AG170. Size: 10cm



This is a detail of the above agate and features the kind of complex, hard-to-explain formations that are a speciality of Brazilian agates. Size: 3cm



This is a tiny area from a large piece of a wonderfully-named American Flame-tail Rooster Agate. The brilliant-red 'vegetation' is the source of its generic name, moss agate, and is formed by crystalline growths of impurities such as iron oxide. Size: 3cm.



This detail from a large slice of Brazilian agate is formed of a brilliant orange 'island' of agate surrounded by what appears to be a dark brown 'moss' agate, most likely consisting of manganese oxide, and this in turn is ringed by crystalline quartz. Size: 2cm.


This image, scanned with transmitted light from the perimeter of a banded agate, shows an island of quartz framed by the concentric rings of agate 'eyes', which are generally the result of slicing through hemispherical formations that typically develop near the outer surface. Size: 3cm.


This Madagascan agate shows many classic features: concentric banding; 'eyes' sliced through hemispherical formations; the ends of hollow tubes that formed around inclusions of other minerals such as rutile or geothite; and areas of crystalline quartz. Size: 7cm.





The banded formations of this agate are a wildly distorted version of the classic 'fortification' type. The distortions are thought to be the result of internal forces operating prior to crystallisation, but their precise nature is not understood. Size: 7cm.


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