jamesp
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Post by jamesp on Nov 29, 2014 14:14:05 GMT -5
I will have to take some photos. The most change is in the mechanical properties. It has about a 500-800 grit surface instead of a 200 grit finish at flaked surface. Showing a slight glare. The chip seems to carry longer and feather thinner. As mentioned, decreased water absorption. Only did about a 12 ounce piece. No added fractures noticed. Durable material. If Rick has a 700F oven I would suggest 650F, probably 700F. I will definitely cook the whole MFRB box and then chip it for tumbles. Few slabs. I have a hot spot in the oven that will pull +650F, that's where they will go. Cook them by themselves so the heat will get a bit hotter; this load had 80 pounds of coral w/it, add sand. Will put some select yellow flint in with it that turns rust red when above 620F, a red neck thermometer that is dead accurate. You guys are in Rhyolite country, may be a great one to play with if it is close by. Nevada/Utah has great rhyolite. It appears long points could be knapped; this stuff has about no fractures.
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Post by 1dave on Nov 30, 2014 10:28:58 GMT -5
Thank you for the info! Yes, Utah has rhyolite like Florida has sand. Most of it is in flat bands, but where it flowed around obstacles there are interesting pattern changes.
Decreased water absorption - perhaps dye before baking? If I find some good stuff I'll send you some probably not before spring.
Did you try baking the gold sheen?
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jamesp
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Post by jamesp on Nov 30, 2014 11:24:36 GMT -5
Thank you for the info! Yes, Utah has rhyolite like Florida has sand. Most of it is in flat bands, but where it flowed around obstacles there are interesting pattern changes. Decreased water absorption - perhaps dye before baking? If I find some good stuff I'll send you some probably not before spring. Did you try baking the gold sheen? Never baked the obsidian. Seems too inert, but who knows. It has color. Look close at the grain, it is coarser on this not cooked piece, was hard to chip, and did not have razor sharp edges. Chip not so smooth, has slight ridges and wanders This one cooked. A bit deeper purples and reds. Razor sharp edges. Long smooth thin chips. About like glass. Surface noticeably less grainy. Easy to chip. Better control on direction. Color seems to still be changing a bit. Bands sure seem more defined The whole 12 ounce piece. Not real big to work with. But easily clipped the color bands at will.
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jamesp
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Post by jamesp on Nov 30, 2014 11:29:31 GMT -5
Had the rest of the rhyolite drying at 200F overnight. Probably not necessary, this stuff holds little moisture. Better safe. Just cranked it up. Should get 50-70F hotter this time. +650F Pretty stuff bsky4366
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Post by 1dave on Nov 30, 2014 14:34:33 GMT -5
Very nice! Obviously I was too snooty in my youth. I should have paid more attention to all possibilities instead of just the "prime" stuff.
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jamesp
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Post by jamesp on Nov 30, 2014 14:50:48 GMT -5
Very nice! Obviously I was too snooty in my youth. I should have paid more attention to all possibilities instead of just the "prime" stuff. Dave snooty... I don't think so. figuring humble beginnings Particular about good rock, oh yea Rhyolite up to 350F. 300F to go. I would guess you could avoid the ramp with that stuff. about as stable a rock as I have ever seen, or at least this stuff is
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Post by 1dave on Nov 30, 2014 14:59:08 GMT -5
It was MY BIRTHDAY and I can be snooty if I want to! Especially when I have good friends to knock me back down again!
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jamesp
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Post by jamesp on Nov 30, 2014 15:49:53 GMT -5
It was MY BIRTHDAY and I can be snooty if I want to! Especially when I have good friends to knock me back down again! Yes Dave. Enjoy your tantrum, it is your day
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Post by 1dave on Nov 30, 2014 20:13:20 GMT -5
It was MY BIRTHDAY and I can be snooty if I want to! Especially when I have good friends to knock me back down again! Yes Dave. Enjoy your tantrum, it is your day Thanks ! What? no embarrassed smiley? We are so often bare assed.
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jamesp
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Post by jamesp on Dec 1, 2014 1:22:33 GMT -5
Where is that photo of you and the hammer ?
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jamesp
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Post by jamesp on Dec 1, 2014 1:25:58 GMT -5
Wife said I slept thru the timer alarm. She woke me. So I could go turn off the rhyolite. Looking forward to getting it out of the oven tomorrow.
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Post by rockpickerforever on Dec 1, 2014 5:05:52 GMT -5
Dave's mind is a force. It may be a black hole. No, he just has a genuine passion for geology. Keep the info coming, 1dave. Enjoying it, many thanks!
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Post by 1dave on Dec 1, 2014 7:36:49 GMT -5
Where is that photo of you and the hammer ? This one of my normal placid self?
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Post by rockpickerforever on Dec 2, 2014 1:25:19 GMT -5
Wife said I slept thru the timer alarm. She woke me. So I could go turn off the rhyolite. Looking forward to getting it out of the oven tomorrow. So what happened with the rhyolite? How'd it come out? Did I miss this? I think someone was having too much fun playing with avatars today to take care of the business at hand... C'mon, James, first things first.
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jamesp
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Post by jamesp on Dec 2, 2014 4:53:43 GMT -5
Going to look at that rhyolite closely. Got some welding weather, so that was task at hand. Initial thoughts were not so much color change. Tapped a few tumbles out of it, it reacted to the heat well. El primo for knapping, has about the same properties as a toilet. Ha, toilet ceramic is used for practicing and learning knapping. Add the bands, and the unidirectional 'chippability', cool tumbles should happen. Got to sit and get a groove to see what can be done w/it. Not quite meditate, but get a clear mind Jean
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Post by 1dave on Dec 2, 2014 10:43:32 GMT -5
Dave's mind is a force. It may be a black hole. No, he just has a genuine passion for geology. Keep the info coming, 1dave. Enjoying it, many thanks! Thanks Jean! A retired military instructor told me: I've found I learn best by trying to teach others. Their bewildered expressions alert me to the places where I didn't know I didn't know. Thanks RTH for this opportunity and privilege. Dave
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Post by Pat on Dec 2, 2014 11:28:53 GMT -5
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Post by fantastic5 on Dec 2, 2014 12:28:08 GMT -5
[quote author=" 1dave" source="/post/780857/thread" timestamp="1417535012[/quote]I've found I learn best by trying to teach others. Their bewildered expressions alert me to the places where I didn't know I didn't know. Thanks RTH for this opportunity and privilege. Dave[/quote] I couldn't agree more. I too learn best by teaching. Professionally I've had an ancillary role as a teacher for as long as I can remember. My favorite role was definitely teaching new doctors their laboratory practicum. They all came out of med school knowing everything. Usually took well into their second year of residency before they suddenly realized that the lowly lab tech actually knew a lot more about lab work, tests and values than they did. That is when things got really good. I was able to teach what I knew and at the same time learn so much more about practical medicine that I wasn’t taught in grad school. I miss that job!
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Deleted
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Post by Deleted on Dec 4, 2014 10:41:04 GMT -5
I missed this thread. Sorry friend.
Dave you are a hero and a mentor. Thanks for all you do and have done. You are the best!
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