jamesp
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Post by jamesp on Jan 22, 2013 12:42:18 GMT -5
This is the best i can do.The coral is fairly dull till the heat got a hold on it.The incandescent light enhances yellows and oranges.The before' is less attractive than the photo.The after' is accurate. Before After
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Post by FrogAndBearCreations on Jan 22, 2013 12:56:45 GMT -5
Nice!
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Fossilman
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Post by Fossilman on Jan 22, 2013 17:23:24 GMT -5
I like too!
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Post by Pat on Jan 22, 2013 18:12:38 GMT -5
Heat seems to intensify colors in rocks. Is there any rock where heat lessens the color? Curious.
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jamesp
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Post by jamesp on Jan 22, 2013 18:45:37 GMT -5
If the rock is clear or white or close to either it rarely changes.Never had anything go duller.Iron is so common in nature. Most rocks have iron.The infamous red clay here in Georgia is full of iron.Most changes from heating is in the red yellow and orange portion of the rainbow.In this case a hohum brown/yellow turned similar to that California orange you posted a pic of Pat.Rock that are exposed to water w/iron can change on the rind,especially if cycled in and out of the water like tidal conditions or cycles of drought. The crazy colors in the Savannah river agate i cannot explain.Like green and purple-copper and mangenese?maybe But the iron is simple.
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Deleted
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Post by Deleted on Jan 22, 2013 18:54:20 GMT -5
jamesp - iron makes purple in amethyst but not in your stones because ----> Pat amethyst fades to citrine when heated my blue granite bathroom counter faded to orange when power dry sanded. If you look at the image below you can see the straight line where the blue granite faded to pale orange because of the head of sanding the bullnose.
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jamesp
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Post by jamesp on Jan 22, 2013 19:04:26 GMT -5
What do you mean?I see the color difference,in the back splash too.Also looks blue at the faucet.Plese explain Scott.
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Post by helens on Jan 22, 2013 20:19:18 GMT -5
Beautiful coral, and what a great countertop!!!
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The Dad_Ohs
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Post by The Dad_Ohs on Jan 22, 2013 20:26:47 GMT -5
jamesp - iron makes purple in amethyst but not in your stones because ----> I didn't know Amethyst gets it's purple from Iron??? So I guess that my amethyst has red tips from excessive Iron in it?? I do know that the red tip is caused by iron, but didn't know the rest... good info Shotgunner... thanx!!
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Minnesota Daniel
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Post by Minnesota Daniel on Jan 22, 2013 23:40:28 GMT -5
Don't you think maybe the counter top was dyed? Changing the oxidation state of iron takes about 600 to 900 degrees Fahrenheit for an extended period of time. Wood will ignite 600 degrees. I don't see how it could have gotten that hot that far from the front edge either.
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Deleted
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Post by Deleted on Jan 23, 2013 14:46:00 GMT -5
Daniel, I wont try to battle temps and oxidation states. My chemistry knowledge is way too old and my mind too feeble. I will tell you that the blue section of this granite is a very nice blue. A bit deeper than the sky, but not robins egg nor royal blues. What I do know is, yes it did fae in the areas worked, and no it wan't dyed. If you saw the stone in person, you would agree it was not dyed. Two weeks in the granite counter biz, and I have yet to see dyed material. At least obviously dyed material. Daniel, may I delve into your chemistry knowledge? Both the orange and the blue in this stone can come from different oxidation states of iron, correct? The both faded to a similar tan color. If you look at the bull-nose along the front threr is a straight line of color change. Even the deeper orange section left of the blue has faded to the same light orangish tan color. If you look at the backsplash on the back far right you can barely make out that the top edge is not blue but the adjacent front area is still blue. Close inspection shows the color change only penetrated 1/32" or so. If I start making some money here soon, I may re-hire the craftsman that did the work to come back and rework it wet, to remove the faded bit and, hopefully, reveal the blue that still remains. I do not find it hard to believe that at the point of diamond dry cutting granite that there is enough heat to make a very small volume of stone reach 900F. Color change did not penetrate very deep. Specially in the areas that were rounded off using an hours worth of work to go from square to round all dry cut and polished. I owe you all more images.
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jamesp
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Post by jamesp on Jan 23, 2013 16:24:45 GMT -5
I think you were doing a chemistry experiment-were you hitting the sauce and playing with that muratic acid Scott?:>
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Minnesota Daniel
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Post by Minnesota Daniel on Jan 24, 2013 0:51:20 GMT -5
Granite is basically quartz, feldspar, mica and sometimes lesser amounts of various other minerals. The orange in granite though is feldspar, which doesn't contain iron. There are blueish "feldspars" like sodalite or lapis, but I've never heard of blue granite from those. I don't think they change color if you heat them either. I did a little checking, impurities in the quartz can make it look blue, but I don't think those impurities would include iron. I'd guess that other minerals in the granite might make it look blue too, so perhaps iron doesn't have anything to do with your heat induced color change. You got me.
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