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Post by nichwhitt on May 11, 2012 21:57:55 GMT -5
This was on the edge of a fire pit...I'm wondering if the heat from fire is why the color is so deep. If thats the case I wonder if it would only affect the surface? Attachments:
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Post by arappaho on May 12, 2012 7:33:51 GMT -5
HA! Quartzper! I like it!  What kindof fire pit? But yes, heating some types of jaspers and agates will darken the colors. Light browns and tans will often times turn to reds and purples. White or light areas can turn to nice blues and greens depending on the material. And the color can change all the way thru depending on the degree of heat. |
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Post by rockshine on May 12, 2012 8:38:27 GMT -5
In the mountains of western NC and East Tn, one often finds quartzite boulders with the reddened outside around firepits from ancient campfire sites. Most of these color only for a couple centimeters with the deepest color outside, and the original white quartzite inside.
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Post by arappaho on May 12, 2012 11:00:30 GMT -5
But that's quartzite and not jasper or agate.
The Sedimentary rocks are really the only ones susceptible to
alteration by heat. The Igneous and Metamorphic, not so much.
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Post by justarock on May 12, 2012 19:57:10 GMT -5
I have lots of white quartzite with a red "rind" on my place. I thought it was from the iron, I also have lots of Limonite.
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Post by nichwhitt on May 12, 2012 22:01:28 GMT -5
Just a campfire pit, just sitting on the edge, so it doesnt seem like it was in there very long. I'll work it once I've had a little practice and repost.
Thats pretty cool, rockshine, about tje ancient firepits. Its easy to lose sight of that kind of thing in this WalMart world we live in.
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Post by rockshine on May 13, 2012 8:32:32 GMT -5
If you practice a bit of dyslexic transposition, you can read that as Mall-Wart.
Back in those "days", I walked three miles to the store, but once inside, I could pick up anything the store had to sell with just a few steps. Now I drive to the store, walk three miles from the car to the store, and then walk another three miles to get the item I came for, only to stand in a line of twenty people for the one checkout open out the twenty-four available. I once asked, rhetorically of course, what good does it do to have $20 million worth of goods for sale, if no one is there to take the money?
Just poking a little fun at a store that, in my opinion, has gotten too big for it's britches, and hasn't improved by it's growth.
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Post by nichwhitt on May 13, 2012 21:31:24 GMT -5
Mall-Wart indeed...microcosm of the class war. What IS the point of having all those checkouts? Maybe they were counting on the zombie apocalypse and all those lanes are for the hordes stocking up on 20lb bags of bullets and rice...
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Post by arappaho on May 14, 2012 6:57:51 GMT -5
If it weren't so true............It'd be really funny.
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