Buy Indonesian opals direct from miners and wholesalers.
Volcanic opals are mined in Kalimaya River in java and Banten Indonesia.
is pastel green opal that can be cabochon or as carving material as it is soft
opal and easy to cut and polish
specimens are slabs cut and sold as rough. these do have crack line sand
inclusions so they need to be worked to cracks are not in the final product.
does have petrified wood and this is dark bitumen colour, while some are
natural it seems most is cooked in sand and oil added to enhance the opal colour Indonesia has volcanic Opals and large deposits of black
This wood is actually a fossil as when the
tree dies it was
buried in clay, ash and sediments so the
timber was oxygen staved and did not decay
Over time silica seeped into these black
fossils that still have wood and cellular structures
So this fossil you can still make out cellular
structure of bark and sometimes rings of the wood or timber
These fossil specimens do weigh heavy than
they look, as the cellular matter is dense
This natural fossil is carbon bitumen black colour and sometimes needs to be smoked by heating in sand treated to show opalized colours
Many sellers add oil to this opal a sit
greatly enhances the opal colours and hides pits in the opal, so always check
if opal is smoked or oiled as it does enhance the colours.
Body tone is N2 for most of these opal
The carbon in the wood is replaced by hydrated
silica in the
cellular structure.so when the petrified
fossil is treated the opalized colours
are visible due to deflection and diffraction
as light passes through the
planes of silica in these cellular structures.
Petrified wood is not rare, as it is found in
around the world but opalized wood is rare
It is found in Banten area and Salak national
park in Indonesia
and also in Virgin Valley USA and all
locations are volcanic regions.
Each eruption release incredible volumes volcanic
ash which is high in silica
content ,and this helps explain why Indonesian
petrified wood is opalized in stunning colours
as the country has many volcanoes
and long history volcanic eruptions
Volcanic ash is full carbon which gives the
colour which is the predominate colour, but
ash also contains traces Copper,
which results in blue green hues. Ash also has
Iron oxide which result in red
to yellow hues and ash has some magnesium
oxides that give hues yellow to
orange so all these factors help to explain
why these fossils have opal colours,
due to the volcanic ash over millions of years.
Petrified wood has been called many names
Kalimaya area did have large opal mines but today
very few and only small operations. only speckers find few opals now. unfortunately,
lot opal wholesalers in Indonesia buy Ethiopian opal and market it a s their
local opal as Kalimaya Black Opal.
opened large market for opals in Indonesia and today they google search these
key words looking for local opal.
local moss agates and agates with crystal formations are sold a s opals now and
black opal is treated Ethiopian opal that has been smoked Some other names used
by locals include Batu black opal,Opal kalimaya,Kalimay, Batu,Batu opal Kalimay
black opals,Akiki black opal,kalimaya black opal harga,kalimaya black opal
bahan,alimaya black opal sempur,batu kalimaya black opal sempur.
Locals do make
lot mens rings with diamonds from these opals and agates but it is very
confusing as even local gemstone laboratories with certify that it is local
opal collectors must have at least one opal from this region .
local terminology for local stones named opal in Indonesian -Characteristic
Lumpur on Black Opal or Stone Opal or Kalimaya, Batu Mulia , , Stone Bacan ,
Stone Black Opal , Jade Aceh , , Characteristics Stone Bacan , Jade , Stone
Badr , Kalimaya Black Opal , Indocrase Aceh , Stone Pancawarna , sempurnya