Some information on sapphires

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charlie123 said:
http://australianmuseum.net.au/uploads/journals/17941/1358_complete.pdf
It is a very long reed, very in depth, a little scientific. There is valuable information on this pdf
Click to expand...

Was only skimming but this bit caught my eye...

The basaltic eruptions that introduced gem corundum,
zircon and garnet into the deep leads and later alluvial deposits
Click to expand...

Zircons? My understanding was that zircons are derived from ancient granite and the zircons on my field are far, far older than the sapphires and that they are found together largely because they are both heavy minerals :/ Interesting....
 

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