Geoff
spending too much on rocks
Please add 1074 to my post number.
Member since December 2012
Posts: 446
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Post by Geoff on Jan 15, 2013 15:37:34 GMT -5
Heated to 1100f over a period of 15 hours.  |
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Post by helens on Jan 15, 2013 16:06:41 GMT -5
What did you create it from?
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Geoff
spending too much on rocks
Please add 1074 to my post number.
Member since December 2012
Posts: 446
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Post by Geoff on Jan 15, 2013 16:09:53 GMT -5
Amethyst. Its not real citrine. Its heat treated Amethyst, which is what most citrine on the market is anyway. Its the other half of the Amethyst in the picture.
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Post by Pat on Jan 15, 2013 16:17:24 GMT -5
Neat! I'll have to try that on some ho-hum amethyst. I wonder if you could get a deeper yellow if you kept it in the oven longer. Hmmm, my toaster oven only goes to about 500f.
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Geoff
spending too much on rocks
Please add 1074 to my post number.
Member since December 2012
Posts: 446
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Post by Geoff on Jan 15, 2013 16:37:26 GMT -5
Definitely. I was leary about leaving a 1100 degree heat source on over night. Not exactly a crock pot!
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Post by orrum on Jan 15, 2013 16:45:12 GMT -5
I have heard you can do this by putting sand in a crock pot n then put the amethyst in and cover it with more sand and turn it on for a few days on high with no drafts. In a place thats burn proof. Then turn it to low for a couple days cause you gotta cool it slow or the amethyst/citrine cracks. Then turn it off and do not disturb for a few days so it gradually cools down. I am gonna try this one day.
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Post by Pat on Jan 15, 2013 16:48:36 GMT -5
orrum, I think I'll follow your time table in my toaster oven. Mookaite changes color nicely in the toaster oven. I used sand with that also. Slow was important.
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Post by orrum on Jan 15, 2013 18:24:06 GMT -5
Hey Pat I have some mookite, whats it do when heated? Can you still cab n saw it after heating?
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Post by Pat on Jan 15, 2013 18:35:49 GMT -5
orrum, it turns the mustard into catsup, and generally deepens the other colors. I posted a thread with photos on this board when I did it, but I cannot find it.
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Post by Jugglerguy on Jan 15, 2013 18:38:04 GMT -5
I like amethyst better. Change it back, please.
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Post by orrum on Jan 15, 2013 18:44:32 GMT -5
LOL Juggler, thnks Pat I am gonna try that!
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Geoff
spending too much on rocks
Please add 1074 to my post number.
Member since December 2012
Posts: 446
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Post by Geoff on Jan 15, 2013 19:18:16 GMT -5
Alright. It'll take a couple months, but I should have a strong enough gamma source to do ir=t.
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Geoff
spending too much on rocks
Please add 1074 to my post number.
Member since December 2012
Posts: 446
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Post by Geoff on Jan 15, 2013 23:01:25 GMT -5
I have heard you can do this by putting sand in a crock pot... Not sure about that, in Kurt Nassau's book "Gemstone Enhancement" the lowest temperature I can find for changing the color of Amethyst is 350C (662F). A little warmer than most crock pots will go. And this is only for the Fe2+ flavor that is heat treated to create Prasiolite. Fe3+ Amethyst is heated to 450C (842F) to create the "Burnt Amethyst" Citrine. |
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Post by orrum on Jan 15, 2013 23:09:50 GMT -5
The way I understand it the crock pot gets way hotter because of the sand. Dont know but definitely trying the mookite, I have ametyst too, maybe put some of each. You know old cheap crockpots dont have thermastats.
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Post by gingerkid on Jan 16, 2013 0:37:43 GMT -5
Very cool experiment, Geoff! Now, can you turn the citrine back into amethyst? Wow, you left it "cooking" overnight and for 15 hours?  |
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Geoff
spending too much on rocks
Please add 1074 to my post number.
Member since December 2012
Posts: 446
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Post by Geoff on Jan 16, 2013 0:45:27 GMT -5
I have a couple small pieces that broke off. I'm going to put one in my radiation "hot box" with a .01 Curie Co60 source, and one with my .5 Curie Ra226 source to see if it will turn back to amethyst. I'll report back.
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Post by Roller on Jan 16, 2013 0:45:33 GMT -5
nice experiment ..!!!
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Geoff
spending too much on rocks
Please add 1074 to my post number.
Member since December 2012
Posts: 446
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Post by Geoff on Jan 16, 2013 6:26:33 GMT -5
Here it is glued back together. I slathered the seam in 330 and then found out it was too big for my vacuum chamber.  Here you can see how the chalcedony turned to white, as expected.  And here is the back, showing that they were in fact the same piece.  |
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Post by Pat on Jan 16, 2013 10:20:54 GMT -5
That is really cool!
If heat diminishes the color, could you cool it to augment the color?
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Post by orrum on Jan 16, 2013 10:30:34 GMT -5
Dont think cooling is a good idea. I separate the not bonded tightly bound layers of rose quartz from the loose ones by freezing it wet, the water gets in the cracks n expands as it freezes into ice, then I take it out of the freezer and immediately toss it in a big pot of boiling salted water. The thing does not shatter the good tight joints of layers but the ones that usually break free while sawing n cabbing pop loose. That way you can cab a piece with all the striations and fractures (which are way coolo in a cab) without it falling apart! Wonder if this would work with the fractures in jasper that brwak cabbing
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