jcinpc
has rocks in the head
Member since April 2009
Posts: 722
|
Post by jcinpc on Apr 17, 2009 11:32:23 GMT -5
|
|
|
Post by Tweetiepy on Apr 17, 2009 13:26:13 GMT -5
I'm a total ditz! :blush: - I was looking at the 5th & 6th pictures and thought to myself, "Cool! He added clam shaped rocks to the top and they turned black once they were cooked!" not realizing that they were briquettes! Doh! I sure feel stupid now! :serious:
You did a great job, I didn't know you could cook those too! I love the colors!
|
|
firewalker45
freely admits to licking rocks
Member since August 2006
Posts: 929
|
Post by firewalker45 on Apr 17, 2009 13:27:45 GMT -5
Great tutorial, great pics, great results. There must be great satisfaction in mastering the traditional(old ways). Thanks for sharing! Daniel
|
|
|
Post by Michael John on Apr 17, 2009 14:02:07 GMT -5
Aside from knapping, are there advantages to heat-treating agate for tumbling, slabbing, and/or cabbing?
Does the heat treating dramatically enhance coloring and/or contrast?
"You can also use a turkey roast, take the pan out and fill with dry sand and start at 200 and adjust 50 degrees eevry hour and most roasters go to 450-500 hold temp for 24 hours and ramp down."
What is the ramp down? Also 50 degrees per hour?
Is blowing-up the rock also a distinct possibilty using this oven method? Would more gradual heating and cooling help to minimize the possibility?
|
|
|
Post by Bejewelme on Apr 17, 2009 15:27:02 GMT -5
It is pretty cool, cooking those rocks, definately something very interesting. I like the pics and the before and after pics.
MJ- Bobby cooked some agates a few weeks ago, and they exploded in his oven!
This would not be something for me to try!! I am enough of a danger to myself!
|
|
|
Post by mohs on Apr 17, 2009 15:36:39 GMT -5
happiness is a warm rock o yes it is
i get some ribs on there smok'n rock'n ribs
excellent !!!
|
|
docharber
has rocks in the head
Member since October 2008
Posts: 693
|
Post by docharber on Apr 17, 2009 18:57:57 GMT -5
The self-cleaning cuycle would probably work pretty well. Turn it on and leave it overnight. Carneliany!
Mark H.
|
|
jcinpc
has rocks in the head
Member since April 2009
Posts: 722
|
Post by jcinpc on Apr 17, 2009 19:30:11 GMT -5
I dont know about agates, I have a chart somewhere of what temps to cook certain rocks, alot of Tx rocks, tab ,perd, ft. payne, need to be cooked, coastal plains cooked rivals most colors I have seen in coral ( Ala. Ga.) yes the ramp down would be the same as up.....50 degress at a time per hour. flint ridge, horse creek etc Its harder to blow up rock using the turkey roaster because you can only take it up to 500 on some models. The coral I blew up was hitting around 650-700 , the wind got it 2 days ago when our "cold front" blew in. yes it does help the rock in working it for cabbing slabbing etc, it is best to slab then cook it .Thats why the indians did it.
|
|
rockhound97058
freely admits to licking rocks
Thundereggs - Oregons Official State Rock!
Member since January 2006
Posts: 760
|
Post by rockhound97058 on Apr 17, 2009 23:18:39 GMT -5
Many flintknappers heat treat agates, Jaspers etc.... for use in knapping. Each material has it's "happy spot" where it seems to do it's magic. What I mean by that is for instance... A local material called Dolphite Agate which my buddy mines also contains a nice jasper (very close to Biggs jasper)... When heat treated this material can change color from a brown to a nice purple tint. It also makes the stone much more brittle and easy to "flake" when treated.
Now in regards to ramping the temps in the oven. Some rocks need a much higher temp than a normal over it capable of doing... However a person starts off at the lowest temp and for example every 30 minutes raise the temp 50 degree's. Once you max out your temp hold it there for an hour up to several hours. Then reverse your process.... Start ramping down the temp untill the coolest setting and shut off... Let sit until completely cool before opening the door.... If you have a hot rock and expose it to a sudden burst of cool air it'll crack to pieces. ALso keep in mind most all flintknappers heat treat slabs rather than a complete rock... Reason for is a slab will heat evenly whereas a rough rock will have a higher outside temp than the core, thus creating fractures.
Many rocks will change very nicely when cooked... Brazilian agate changes very nice! some of it changes into a intense red color. Priday polka dot material will change the color of the "dots". As you notice JC's coral changes into a nice red.... His coral is awesome material.... we did some trading a year or two ago and I'm ready to swap for more!
Hope that sheds some light!
Jason
|
|
jcinpc
has rocks in the head
Member since April 2009
Posts: 722
|
Post by jcinpc on Apr 17, 2009 23:36:58 GMT -5
DUDE, how ya been? I have some set aside already for you, some KILLER pinhead, what are you wanting to do with it and that will tell me the size of the heads I`m looking out for you. Email me when you get a chance got a ? to ask about a guy who has a mine near you and wants to trade box for box. As for the color changes it all depends on the iron/minerals in the clay that surrounded this coral when it was a wee pup Most of the time I can look at the clay and tell what color this coral will be before I even dig it up
|
|
rockhound97058
freely admits to licking rocks
Thundereggs - Oregons Official State Rock!
Member since January 2006
Posts: 760
|
Post by rockhound97058 on Apr 17, 2009 23:53:21 GMT -5
I went ahead and sent you a pesonal message!
|
|
|
Post by Michael John on Apr 18, 2009 4:24:27 GMT -5
I was thinking about this a little. Quartz commonly has water pockets. Agate is quartz. When water heats it expands. KABLOOEY!
I can get sand just a few miles from here. I might stick a bunch of different stuff in the oven and see what happens. I wonder what it would do to chrysocolla in quartz, boysenberry agate, etc.
|
|
jcinpc
has rocks in the head
Member since April 2009
Posts: 722
|
Post by jcinpc on Apr 18, 2009 8:10:32 GMT -5
If I am cooking rock that is freshly dug by me then I put all spalls in my roaster at 200 for a day or 2 or 3 to take any moisture out before I cook them. Let me know how your works out . I have only cooked cherts and coral.
|
|
bushmanbilly
Cave Dweller
Member since October 2008
Posts: 4,719
|
Post by bushmanbilly on Apr 19, 2009 13:20:57 GMT -5
Found this should help ya MJ. Exploding rock, hot charcoal. Hmmmm could see a fire happening be careful. Optimum Rock Treating Temperatures
Rock Description/Name (Alphabetical) Preform Thickness Max. Temp. Special Instructions/Comments
Agatized palm wood, translucent (Texas) Slab <.25" 450-500 Beautiful! Alibates Flint, various colors (Texas) Biface <1" 500 Allendale (Briar Creek) Agate (S. Carolina) Biface <.5" 500 Gets red highlites with heating Amethyst agate, purple w/dendrites (Nevada) Slab <.25" 350-450 Incredible! Arizona petrified wood Slab <.25" 500 Battle Mountain Jasper, white to tan (Nevada) Slab <.5" 500-600 Battle Mountain Jasper, white to purple (Nevada) Spalls <1" 550-650 Biggs Jasper, dark brown, smooth (Oregon) Biface <1.25" 450 Nice gloss Biggs Jasper, with pattern (Oregon) Slab <.8" 550 Biggs Jasper, massive gray/brown (Oregon) Slab <.8" 600 Blackskin Agate (India) Slab <.25" 550 Bloodstone, green and red (India) Slab <.3" 550 Boone Chert, gray (Missouri) Spall/biface <.25" 550 Brandon Flint (England) Slab or spall <.4" 500 Thicker pieces will potlid Brazilian agate, red to white Slab <.4" 600-650 Brazilian agate, white to brown Slab <.4" 500 Brazos River Flint Cobble (Texas) Slab or biface <2" 600 Bruneau Jasper (Idaho) Slab or end <.5" 600-700 Buffalo River Chert, tan (Tennessee) Spall <2" 600 Burlington Chert (Illinois) Bifaces 575-650 Hold max temperature for 72 hours Burro Creek Jasp-Agate, purple (Arizona) Slab <.25" 550 Butterscotch Flint (Georgia Coastal Plain) Slabs < 0.5" 450-500 a.k.a. Flint River Carnelian Agate (Oregon) Thick pieces 500 Carnelian Agate (Oregon) Slab <.25" 575 Red color increases with hold time Chert, tan (Kentucky) Biface <1.5" 600 Cobden Flint (Illinois) Thin spall 500 Devine Terrace Flint, chocolate color (Texas) Biface <1" 350-450 Long drying time, gloss Devine Terrace Flint, tan (Texas) Spall <.8" 400-450 Long drying time, satin finish Flint Ridge Chalcedony, gray (Ohio) Biface <1.5" 550 Flint Ridge Chalcedony, gray (Ohio) Slab <.25" 650 Flint Ridge Chert (Ohio) Slab or biface <1" 600 Flint Ridge Chert, orange, (Ohio) Slab <.3" 650 Florida Agatized Coral Slab <1" 650 Fort Hood Flint, tan (Texas) Slab or biface <2" 600 Fort Hood Flint, gray (Texas) Biface <2" 500 Fort Payne Chert, brown to tan (Tennessee) Biface <1.5" 600 Georgetown Flint, gray, grainy (Texas) Biface <1" 400 Hornstone, Indiana or Kentucky Spalls and bifaces N/A No heating needed Idaho Picture Jasper Slab <.4" 650 Imperial Jasper, red or green (Mexico) Slab <.3" 500-700 Imperial Jasper (Mexico nodular form) Slab <.3" 650 India Blackskin Agate Slab <.25" 550 India Fancy Jasper, red (India) Slab <.3" 500 India Fancy Jasper, pink and green (India) Slab <.3" 550 Jasper, mottled brown Slab <.6" 500 Long hold times produce color change to red Jasper, black Slab or spall >.5" 500 Jasper, dark chocolate brown Slab <1" 500 Jasper, banded purple and gray Slab <.4" 600 Jasper, red Slab <.5" 400-500 Jasper, striped brown and red Slab <.6" 400-500 Kaolin, brown to red, somewhat grainy (Illinois) Slab <.5" 550-630 Color intensified with heating Kaolin, brown to white, smooth (Illinois) Slab <.3" 600 Color change when heated Knife River Flint (N. Dakota) Slab <.3" 500 Knife River Flint (ND) Slab or spall >.3" 400 Knife River Flint (ND) Chunks 350 CAREFUL! Potlids easily! Kornthal Chert, gray to orange (Illinois) Biface <1" 600 Llano River Flint, red and brown (Texas) Bifaces to 1.5" 350-400 48 hr drying time Llano River Flint, pale tan (Texas) Bifaces to 1.5" 500 48 hr drying time Maury Mtn. Jasper (Oregon) Slab <.5" 500 Maury Mtn. Jasper (Oregon) Slab or spall >.5" 400 McKittrick Chert, fine-grained (California) Tabs <1" 450-600 McKittrick Chert, coarse-grained (California) Tabs <1" 600 Mill Creek Chert, dappled (Illinois) Biface <1.3" 600 Works like Burlington when cooked Moline Chert, pink to gray (Iowa) Spalls <0.6" 650 Somewhat silty Montana agate, clear with pattern Slab <.25" 500 Montana agate, translucent Slab <.25" 450 Montana agate Slab or spall >.25" 400 Mookite (Australia) Slab <.3" 550 Moss Agate, red to clear (Mexico) Slab <.3" 380 Mozarkite (colorful Missouri chert) Slab or spall <.5" 650 Novaculite, various colors (Arkansas) Spalls <2" 850 Nueces River Flint, brown (Texas) Biface <1" 400-450 48 hr drying time Nueces River Flint, red and tan (Texas) Biface <1" 400-500 48 hr drying time Nueces River Flint, white, gray, or pink (Texas) Spalls and bifaces to 1.5" 550-700 48 hr drying time Opal, all varieties Spalls or slabs N/A No heating needed Owyhee Jasper, red to green to tan (Oregon) Bifaces <1" 600 Paiute Agate, white (Oregon) Slab <.6" 600 Paiute Agate, translucent (Oregon) Slab <.6" 500 Pedernales Flint, smooth (Texas) Biface and tabular >1" 420 Pedernales Flint, grainy (Texas) Biface and spalls <1" 500 Petrified (agatized) wood (Washington) Slab <.25" 400 Brown, translucent Petrified (agatized) wood (Grass Valley, Oregon) Slab <.25" 450 Brown with clear agate Petrified (agatized) wood (Washington) Slab <.25" 550 Somewhat opaque Petrified palm wood, opaque (Texas) Slab <.25" 550-600 Nice gloss at 600 Pierson Chert, red to green (Missouri) Slab or spall <.5" 450 Plume agate, orange (Oregon) Slab <.25" 500 Polka dot jasper (Oregon) Slab <.3" 550 Rainey Buttes Limonite (N. Dakota) Spalls N/A No heating needed San Angelo Flint, brown (Texas) Slabs and bifaces to 1.5" 400 48 hr drying time San Angelo Flint, banded tan and brown (Texas) Slabs and bifaces to 1" 450-550 48 hr drying time Sunset Jasper, white to brown to pink (Oregon) Slab <.25" 550 Texas Rootbeer Flint Biface <1.5" 300-350 Translucent, dry 48 hours minimum Thunderegg agate, clear with pint tint (Oregon) Slab <.25" 500
Note: Temperature ramping is 25 degrees F per hour. Hold at 205 degrees for drying. Then continue to desired temp.
|
|
jcinpc
has rocks in the head
Member since April 2009
Posts: 722
|
Post by jcinpc on Apr 19, 2009 16:23:58 GMT -5
thanks, thats what I was looking for, it was posted on the Paleo Planet last year I and I coldnt find it.
|
|