mckinneykathy6
off to a rocking start
Member since August 2018
Posts: 6
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Post by mckinneykathy6 on Mar 25, 2019 14:39:01 GMT -5
I got these rocks at a show yesterday. I am p!anning to make some cabachons once I learn to saw, grind, and polish. Do you think they are Montana agate? I got them at a silent auction part of the show, very little information was provided. Thank you in advance for your feedback.  |
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fishnpinball
Cave Dweller 
So much to learn, so little time
Member since March 2017
Posts: 1,491 
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Post by fishnpinball on Mar 25, 2019 14:56:59 GMT -5
Not montana agate. first glace says might be banded rhyolite. Second glass says might be some version of banded agate.
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Deleted
Deleted Member
Member since January 1970
Posts: 0
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Post by Deleted on Mar 25, 2019 15:06:28 GMT -5
Third guess would be travertine; fourth guess would be some sort of siliceous sinter. Pretty, whatever it is. Try a scratch test to eliminate travertine and similar. |
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mckinneykathy6
off to a rocking start
Member since August 2018
Posts: 6
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Post by mckinneykathy6 on Mar 25, 2019 16:27:46 GMT -5
I got these rocks at a show yesterday. I am p!anning to make some cabachons once I learn to saw, grind, and polish. Do you think they are Montana agate? I got them at a silent auction part of the show, very little information was provided. Thank you in advance for your feedback. It scratches from fluorite so I think it is probably banded calcite. Does that seem accurate? |
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Post by Peruano on Mar 25, 2019 17:30:01 GMT -5
Yep, try a bit of acid on it. If it fizzes it isn't silica (agate or otherwise). Its looks like a carbonate to me (probably travertine). . . but its pretty and will work up easier than if it was an agate.
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