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Lapidary / Gemstone Community Forum
January 21, 2019, 09:15:12 am
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Petrified Wood With Blue Opal and Native Copper

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Author Topic: Petrified Wood With Blue Opal and Native Copper  (Read 51 times)
Taogem
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« on: September 26, 2018, 08:04:54 am »

Truly a beautiful opalized wood ! From Indonesia and described as "petrified wood with blue opal and native copper".

Had never seen anything like this before and was very curious to learn how nature created something this.

Apparently it is a new discovery as of this year, 2018.



Petrified Wood with Blue Opal was first found as pebbles and larger rounded stones (“cobbles”) in streams and near the slopes of three volcanoes in Indonesia's West Java Province. The source deposit was finally located on the steep slopes of Mt. Tjikolak a mere 10 months ago. What the miners actually found was an ancient petrified forest which had been pushed over by the deluge of “stuff” (pyroclastic flow) from a volcanic explosion. Then, over the ages, the wood was fossilized and preserved by opaline silica.





How Does Petrified Wood with Blue Opal Forum?

Once the tree’s organic material (the wood) actually decomposed, which took thousands of years, it was replaced with opaline silica. The water in that silica was very rich in dissolved copper, iron, and manganese. Those copper and manganese deposits are now found inside this blue opal.

The opalized brownish color on the outside of the stones is obviously petrified wood, but magic is inside . . . the lush, rich blue is feathered with manganese and native copper dendrites, some which look like snowflakes or feathers.



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bobby1
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« Reply #1 on: September 26, 2018, 12:54:35 pm »

I got a slab from Jeff Hill at the Prineville Pow Wow and it is expensive but beautiful!
Bob
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Orchids9
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« Reply #2 on: September 26, 2018, 12:57:08 pm »

 These are casts at best, Not petrified wood in the traditional sense. First showed up Tucson 2016. Only a few have had wood structure and quite different from the blue chunks being shown. Most is seam / large chunk nodules so the  "Petrified Wood" label is somewhat in question even with the pieces shown looking like possible logs. The petrified wood label has been given to increase value, common practice with materials from Indo (Fossil Bamboo and fossil mushrooms are two others)

Paul
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Taogem
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« Reply #3 on: September 27, 2018, 08:30:47 am »

Super expensive Bob..  Way over what I am willing to spend on cabbing material. 

Although it has been some years since I have purchased any slabs or rough, as I browse the internet in search of some, I do not remember some things being so darn expensive. Both expensive and what a lot of sellers are offering are such tiny pieces..

Lots of really beautiful materials like this blue opal coming out of Indonesia, but all pretty expensive as well.

I did not quite get the "technical description" given to this material.. Calling it petrified and opal in the same descriptive sentence did not seem correct to me.  I thougt organic material like this would be labelled either petrified or opalized, but not both. I use to think that a wood, coral or other organic material first became petrified, then to be newely described as agatized, or opalized as more time passed and as the material is replaced with more and more silica or opal.

Guess I should already have known this Wikipedia description    hide

"Wood opal is a form of petrified wood which has developed an opalescent sheen or, more rarely, where the wood has been completely replaced by opal. Other names for this opalized sheen like wood is opalized wood and opalized petrified wood".
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Debbie K
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« Reply #4 on: September 28, 2018, 04:33:28 pm »

Wow, what colors! I love the blue. Haven't seen any of it yet.

Debbie
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