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Post by stardiamond on May 8, 2019 13:40:25 GMT -5
Some years ago, I bought a box of Koroit rough. It wasn't very good. I am reluctant to throw anything away and ran across this piece of rough. My wheels and water were set up to sand some cab backs so I decided to play with the rock. I flattened two faces through 220 soft and will mark the two faces. The next time my trim saw is set up, I will cut a slice off each face and see if there is anything there. The rock must have been chosen for some reason by someone who knows the material. The good news is that material is very solid. The bad news is that so far there is nothing there. I might have imagined a spec of opal.    |
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Post by rockjunquie on May 8, 2019 15:14:32 GMT -5
Well, I hope there's something deeper in. Otherwise, it's a dud.
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Post by Rockindad on May 8, 2019 17:12:14 GMT -5
I just wanted to say how much I like the title of the thread  Al |
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Post by pauls on May 8, 2019 17:26:37 GMT -5
I don't think thats Boulder opal matrix at all.
The Boulder Opal fields are enormous, thousands of square Kilometers, so I am not saying that something like this doesn't exist there, but it's mostly sedimentary deposits with variations of iron rich clays and sandstones and pea gravel.
It's not like anything I have seen anywhere across that area, but it is a bit like Mookaite.
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Post by stardiamond on May 8, 2019 18:04:29 GMT -5
My expectations are low and I'll know more after a few cuts. I know who I got it from and am pretty sure it's iron stone. I got a bunch of orbless Bruneau nodules years ago and won't waste the saw on them. I am willing to gamble as long as the cost and time isn't high. Last gamble was a piece of butterfly wing and got one nice and one extraordinary cab from the piece. When I get a new saw, I'll start gambling on Montana nodules.
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Post by hummingbirdstones on May 8, 2019 20:58:45 GMT -5
Sorry to say that it is definitely not Koroit. I have cabbed a lot of Koroit and it doesn't look like that at all. I'm unsure what your stone is, but it looks like some type of jasper, or it could be common opal. It's not ironstone.
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Post by stardiamond on May 8, 2019 21:30:22 GMT -5
The surface where I cut it is definitely a porcelain jasper. Maybe it is Bad Bruneau. The lot of bruneau I got was nodules maybe someone included a piece of a large broken bruneau nodule. It could be bad Morrisonite or bad carasite. I don't rockhound and I have no idea where it came from.
It is way to dense for ironstone. I'll take one cut and I imagine it will look like what I exposed.
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agatemaggot
Cave Dweller 
Member since August 2006
Posts: 2,195
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Post by agatemaggot on May 8, 2019 21:58:05 GMT -5
I really like the title also, will have to add it to my list of comments I use now and then !
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Post by stardiamond on May 8, 2019 22:02:16 GMT -5
Bad Bruneau and Koroit.  |
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Post by hummingbirdstones on May 9, 2019 9:37:54 GMT -5
Yep, the one on the right is definitely Koroit.  |
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Post by stardiamond on May 9, 2019 11:52:19 GMT -5
My best guess is the material is porcelain jasper and likely from Oregon. I'm done with the piece.
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