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Agate 101
Most agates form by the crystallisation of concentric bands of a silica-rich gel that seeps into voids left in volcanic rocks such as basalt. In this example, however, there was insufficient material to fill the void completely, and the hole left in the centre was later filled by horizontal bands from which the images was scanned. Original size: 5cm.
The vast majority of agates are dull grey and brown - and frequently artificially coloured to sell to unsuspecting buyers. This was no exception save for the inclusion of other minerals that magically created the raw material for this image - which, appropriately for agate, suggests to me a cataclysm on a remote volcanic island.
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