1996, they came across an outcrop of strange rhyolite lava
flow that has been completely replaced and silicified
resulting in a wide variety of colors including the bright
ones that made the "Ocean Jasper" quite renowned. At first,
the outcrop can be accessed only when the tide is low, and
that's how they get the name of "Ocean Jasper" as named by
Gem Shop Inc that first imported the roughs. I don't know
why they're called "Ocean Jasper" instead of "Ocean Agate"
since they're made of mostly chalcedony and greenish quartz
(chlorite inclusions?) even we have similar dull green and
yellow jasperized rhyolite coming from a nearby location,
The bright colors and eye-like structures
of the Ocean Jasper have resulted in a high demand for
lapidary purposes, but that also makes them quite expensive.
Now they become more expensive when the source played out a
while ago. It seems to me that the best materials already
have been used used up (I have few in reserve for future),
so the ones with best colors (red and orange) are becoming
difficult to find. The colors are usually white,
yellow, pink and green and occasionally, those with
eye-catching red and orange colors show up.
The reason why I put Ocean Jaspers under thunderegg section
is because they share similar rhyolitic origins as the
thundereggs. The "agate/quartz balls" seen in the Ocean
Jaspers were once H-Cristobalite balls in perlite lava flows
and the Ocean Jasper can be compared to "Morgon Town Poppy
Jasper" Rhyolite formed under similar conditions.
The best source is already exhausted and
roughs are usually available via the sellers' back stocks.
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