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Kogolong


#1

Hi

A gem material called Kogalong is appearing in various European
jewellery shows (possible at Tucson also?) but so far I haven’t
found any clear mineralogical definition. Some say it is a form of
opal, others a form of chalcedony.

Anyone have good (The usual Google search led to
examples on the market, but no useful background

Thanks
Jack Ogden


#2

dear jack,

searching on kogolong, most of the sites seem to be in italian and i
couldn’t find an easy way to get a translation.

“The cachelong is milky-white, and nearly opaque, and is found in
small masses in the river Cach, in Bucharia, and also in Iceland.”

i found this quote on an opal site, but it doesn’t sound suitable
for jewelry. could be the same thing or not. i really don’t know.

cathy