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Post by glennz01 on Mar 15, 2018 19:12:24 GMT -5
Heres some local obsidian, as you can see its nothing like anything else at least that ive seen. Its also the only obsidian i know of that has some agate inside of it. No idea how it forms to get agate inside unless its kind of like basalt agates, but i havent heard of agate in obsidian before. My photos dont quite do justice for the colors, ive got a cab in the works of my blue green obsidian that will hopefully showcase the colors better when completed. Like almost all local rocks, stable cracks are an acceptable evil, ive come across few rocks that dont have any. Just young rocks with harsh environments.   |
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NRG
fully equipped rock polisher
Member since February 2018
Posts: 1,688
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Post by NRG on Mar 15, 2018 19:49:17 GMT -5
As I understood it, obsidian is too "new" to have agate added. To be old enough for agate, the obsidian would have degraded to perlite.
But, rules always have exceptions. Show us the agate!
Have a look at "moganite" and see if it matches your stones.
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Post by glennz01 on Mar 15, 2018 20:43:27 GMT -5
As I understood it, obsidian is too "new" to have agate added. To be old enough for agate, the obsidian would have degraded to perlite. But, rules always have exceptions. Show us the agate! Have a look at "moganite" and see if it matches your stones. The agate is the little white bit in the center of the band. Minute doesn't even come close in description, the only things that do are obsidian And kind of opal but this is not opal. This obsidian comes where our agate assault beds come from. I know this is obsidian as it matches all the charictarists, including being Razer sharp and a local usgs geologist confirmed. It is all possible that this is a new type of obsidian or something similar there of. Our Mountians are very young though and all of our agate and Harper's are soft compared to those found in the states or elsewhere... with a drop saw or gravity feed saw I can cut an 8 by 8 or so inch agate 1 time in about 15 minutes.. possibly less, whereas far smaller states from the lower 48 take the same amount of time to cut or more. Not sure if its because ours are so young or not. But I can fill a 5 gallon bucket full of slabs in 8 hrs whereas lower 48 agates I'd be looking at a medium flat rate to large flat rate box full. This obsidian which is cost size took about 30 to 45 sec to cut. Local agate would take around a min possibly a little more, non local easily 3 to 5 min on agate |
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Post by glennz01 on Mar 16, 2018 1:19:05 GMT -5
Just finished a cab of the more green and black obsidian. Kind of looks like mahogany obsidian but only green. I really like working this material, definitely want to find more this year. The cut doesn't even come close to what it looks like cabbed. I'll post photos tomarrow.. maybe make some more cabs out of a couple other types I have, some are banded. They look dull as a slab but if it's like the one I just did it will turn out nice
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NRG
fully equipped rock polisher
Member since February 2018
Posts: 1,688
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Post by NRG on Mar 16, 2018 9:45:31 GMT -5
I have a friend that will do ir reflection spectroscopy and determine the crystal structure of any.
Mail me a cutoff and I'll share with him.
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Post by glennz01 on Mar 16, 2018 16:33:00 GMT -5
I have a friend that will do ir reflection spectroscopy and determine the crystal structure of any. Mail me a cutoff and I'll share with him. i'll pm you. looking closer at my obsidian with agate it look like its somehow doing a replacement around that area of agate rather than divitrification. ill make a few other cabs of the different types, heres one i completed, photos dont show as much detail as i can see in person. lots of black orb spots some of which you can see on the green side more easily, they are all over the black side   |
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Post by MsAli on Mar 16, 2018 16:34:54 GMT -5
That is some pretty stuff
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