herchenx
Cave Dweller
Member since January 2012
Posts: 3,360
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Post by herchenx on Apr 2, 2012 22:51:56 GMT -5
Posted some of the workup in specimens and slabs, but worked some of this interesting material a little more. I'm not sure how I'm going to finish it because it undercuts badly buy I sort of like it anyway. Work in progress ![](http://daharsh.net/r/chri.jpg)
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herchenx
Cave Dweller
Member since January 2012
Posts: 3,360
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Post by herchenx on Apr 2, 2012 23:57:59 GMT -5
Well "finished" it when it hit the floor.. ![](http://daharsh.net/r/chrk.jpg)
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getyourbone
starting to shine!
Member since February 2010
Posts: 44
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Post by getyourbone on Apr 3, 2012 0:42:57 GMT -5
It became Booohoooakite ![:(](//storage.proboards.com/forum/images/smiley/sad.png) Chrysocolla is my favorite and both breakage and undercutting seem to be a very common occurrence for me. you learn to love it's faults I feel yer pain.
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cccbock
has rocks in the head
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Member since December 2011
Posts: 502
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Post by cccbock on Apr 3, 2012 3:27:40 GMT -5
I bounced a cab across the concrete a couple days ago......had there ben a fly near by I would have sucked him in when I gasped !!
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Post by talkingstones on Apr 3, 2012 5:15:33 GMT -5
I would have cried! Now you have two cabs from it, though. Can somebody explain what this "undercutting" is to me? I keep reading about it and am sure I've probably encountered it, but I don't know what it is.
Thanks,
Cathy
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RocknCritter
spending too much on rocks
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Member since November 2008
Posts: 489
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Post by RocknCritter on Apr 3, 2012 8:51:48 GMT -5
Well, that was a nice cab John. Any idea of the location for the chrysocolla in Colorado? One source lists Chaffee and Lake counties. If you haven't already started grinding the two pieces into two separate cabs, you should take the pieces and inlay another slab in the middle. I've saved a few treasured pieces this way. Since picture is worth a thousand words, here is an example. ![](http://i483.photobucket.com/albums/rr191/Skycritter/inlay005small.jpg)
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RocknCritter
spending too much on rocks
![*](//storage.proboards.com/forum/images/stars/star_teal.png)
Member since November 2008
Posts: 489
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Post by RocknCritter on Apr 3, 2012 8:59:06 GMT -5
I would have cried! Now you have two cabs from it, though. Can somebody explain what this "undercutting" is to me? I keep reading about it and am sure I've probably encountered it, but I don't know what it is. Thanks, Cathy Undercutting occurs when two adjacent areas of rock have distinctively different hardness - i.e one area has a hardness of 7 and the area next to is a hardness of 5. During cutting, the softer area will cut faster than the harder area. The end result will be that the softer areas will be recessed and/or rippled compared to the harder areas. Cerium oxide polish is notorious for undercutting. There is a pretty nice polishing chart on the Covington website. It's a good reference for selecting the correct buff and polishing compound in order to avoid undercutting.
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Post by talkingstones on Apr 4, 2012 5:32:53 GMT -5
Okay! Now I see what you're talking about. I think I've had some of that on some willows I've worked. Makes sense now. Thanks!
Cathy
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