timloco
has rocks in the head
Member since April 2012
Posts: 545
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Post by timloco on Mar 27, 2015 14:20:33 GMT -5
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Deleted
Deleted Member
Member since January 1970
Posts: 0
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Post by Deleted on Mar 27, 2015 22:13:07 GMT -5
That sure looks familiar and you may have solved my puzzle. I do not have a pic of the rough. Jim    |
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rockroller
spending too much on rocks
Be excellent to each other.
Member since October 2013
Posts: 359 
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Post by rockroller on Mar 27, 2015 22:33:02 GMT -5
Whoa timloco! I didn't suspect how green that would be from the first two pics. I just recently found a nice big greenie here in a FoCo area river. I want to cut it but it may be too big for the 10". I hope it turns out that nice! ~Roland |
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Post by snowmom on Mar 28, 2015 6:38:16 GMT -5
YES! I find these here too, and I know jugglerguy has a few. could never pin down what they were.. arrowheaddave cut a rock that looked like this ( from here)and it was blue-green inside, maybe from iron or copper in the water here... this thread forum.rocktumblinghobby.com/thread/66916/rocks-graininteresting. |
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Post by nowyo on Mar 28, 2015 11:09:26 GMT -5
I found this nice little cobble of epidosite while rockhounding last weekend and I just disassembled it in my saw. What a cool rock! It had one big fracture down the middle that made my slabs a bit smaller, oh well. Have a pile of that laying around here. I'd be really interested in seeing some specific gravity numbers on that stuff. Russ |
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rockroller
spending too much on rocks
Be excellent to each other.
Member since October 2013
Posts: 359
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Post by rockroller on Mar 28, 2015 12:10:23 GMT -5
Here is mine. It's a chunker! I would say 12-15lbs. I thought at first it would be unakite since that is not too rare around here, but I'm leaning more toward the epidosite since I don't actually see any pink yet.  Any ideas? ~Roland |
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timloco
has rocks in the head
Member since April 2012
Posts: 545
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Post by timloco on Mar 28, 2015 12:45:22 GMT -5
Yea rockroller that's the stuff. It has varying degrees of quartz in it, the more the better. The best bits I've seen will have a nice conchoidal fracture like an agate and be 7 for the hardness.
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timloco
has rocks in the head
Member since April 2012
Posts: 545
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Post by timloco on Mar 28, 2015 12:53:43 GMT -5
YES! I find these here too, and I know jugglerguy has a few. could never pin down what they were.. arrowheaddave cut a rock that looked like this ( from here)and it was blue-green inside, maybe from iron or copper in the water here... this thread forum.rocktumblinghobby.com/thread/66916/rocks-graininteresting. Yea I've been finding a nice selection of these kinds of rocks here in Co it's everywhere... I should take some more pictures. I'm pretty sure the green is epidote and with the ones I've been finding the more quartz in it the better it shines up. The epidote undercuts in tumbling and doesn't really shine up nice in a cab unless it's with quartz or good granite. I'll have to break out the heavy tote labeled "epidote project" |
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timloco
has rocks in the head
Member since April 2012
Posts: 545
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Post by timloco on Mar 28, 2015 13:18:52 GMT -5
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Post by snowmom on Mar 28, 2015 13:34:18 GMT -5
OK, I think I know what the red is... it is epidote/olivine breaking down. As it breaks down it turns red and is then a morph... can't remember the name (CRS is getting worse) but I'm going to track it down and will post here when I find it. Can't believe I didn't write it down. sigh.
found something but I am not sure this is what I learned as referred to above, this may be another thing that makes epidote turn red. Manganese in the epidote will morph it into piemontite. Not sure if that is absorbed manganese or included at creation. still searching.
I found another reference to the red veins in a scientific paper, saying it was the beginning of serpentization. Since that process is the breaking down of Olivine/epidote in a rock, a gradual deterioration, that confirms the first comment that epidote breaks down to a red substance. Still looking for the name of the red end product. |
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rockroller
spending too much on rocks
Be excellent to each other.
Member since October 2013
Posts: 359
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Post by rockroller on Mar 28, 2015 22:31:29 GMT -5
well timloco, your pics really helped me out. I went for a walk by a river today and I found this little guy. Kinda proud of myself, cuz in the bright sunlight it really looked black. Wasn't until I got it in the shade and my eyes adjusted that it did look green.  ~Roland |
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Fossilman
Cave Dweller 
Member since January 2009
Posts: 20,723
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Post by Fossilman on Mar 28, 2015 23:39:37 GMT -5
Liking the colors!
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Deleted
Deleted Member
Member since January 1970
Posts: 0
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Post by Deleted on Mar 29, 2015 5:47:26 GMT -5
From what I am seeing here this lighter colored piece is the same stuff, different quantities.   I got really excited when I found this stone had red in it but still did not have a clue what it was.   Awesome thread, thank you timloco for starting this. This is probably my favorite local stone after jade. I tried drilling a slab of this to make an e-cigarette holder and gave up because I was afraid I was going to destroy my diamond hole saw. Hard and tough. Jim Russ, nowyo, I will see if I can find the slab that it is written on but I am pretty sure that the SG is 2.87 on one of the stones that I checked. |
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Post by snowmom on Mar 29, 2015 6:13:31 GMT -5
great thread- thanks timloco
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timloco
has rocks in the head
Member since April 2012
Posts: 545
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Post by timloco on Mar 29, 2015 10:06:07 GMT -5
OK, I think I know what the red is... it is epidote/olivine breaking down. As it breaks down it turns red and is then a morph... can't remember the name (CRS is getting worse) but I'm going to track it down and will post here when I find it. Can't believe I didn't write it down. sigh.
found something but I am not sure this is what I learned as referred to above, this may be another thing that makes epidote turn red. Manganese in the epidote will morph it into piemontite. Not sure if that is absorbed manganese or included at creation. still searching.
I found another reference to the red veins in a scientific paper, saying it was the beginning of serpentization. Since that process is the breaking down of Olivine/epidote in a rock, a gradual deterioration, that confirms the first comment that epidote breaks down to a red substance. Still looking for the name of the red end product. Ok then I think that quartz with the red in it must be piemontite then. I found in an area that has a bunch of the epidote so it makes sense. |
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Post by washingtonrocks on Mar 29, 2015 20:10:55 GMT -5
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Post by nowyo on Mar 29, 2015 20:44:24 GMT -5
From what I am seeing here this lighter colored piece is the same stuff, different quantities. I got really excited when I found this stone had red in it but still did not have a clue what it was. Awesome thread, thank you timloco for starting this. This is probably my favorite local stone after jade. I tried drilling a slab of this to make an e-cigarette holder and gave up because I was afraid I was going to destroy my diamond hole saw. Hard and tough. Jim Russ, nowyo, I will see if I can find the slab that it is written on but I am pretty sure that the SG is 2.87 on one of the stones that I checked. Yeah, that looks like the stuff all right. 2.87 sounds about right for S.G., mine is all in that range. I know I have some of that with the red in it and I think that I have some slabbed. Have to look tomorrow. Be interesting to see what these other guys are coming up with for S.G. Russ |
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Post by Jugglerguy on Mar 29, 2015 21:29:35 GMT -5
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Post by broseph82 on Sept 22, 2015 12:34:33 GMT -5
rockrollerSecond slab outer side:  As I'm getting closer to the center: 
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