Hi friends, I went to town today and found about 1.5 pounds of obsidian at Vinnie's Thrift Shop (75 cents). It's in three pieces, roughly 3" x 5" each, up to 1" thick. Some edges are thin and extremely sharp. I've never tried to polish this glass as I haven't had any rough material. Now with this, and maybe getting more, it may be time to try. It would have to be made into much smaller pieces, and I'm stumped as to how to cut it. Would my trusty little 7" tile cutter likely work. Using a saw seems counter-intuitive. I would expect the material to shatter. Can anyone set me straight on how to get it into smaller bits? Also, would it work to make up a load by adding pieces of ordinary glass? Thanks for your help. Cheers! Robbiejohn.
Post by ColtChainmailJewelryDesigns on Jul 20, 2011 3:18:29 GMT -5
Cutting it with a saw is a GOOD thing!!!! It's not likly to shatter unless it gets snagged or something. But I really should zip it before I say something that i dont even know about the truth, lol!
You can smash it with a hammer, but with so little amount you have, not a good idea. Smashing Obsidian make lots of tiny shards. But that isn't the way I do it anymore. And I find you can get lot less tiny shards (if any) if you hold the rock, and tap it on a sledg hammer on the ground! Seems like it brakes off larger bits. =)
You're better off tumbling obsidian with obsidian (of the same type). Using glass as a filler may work, but there are too many variables to know. Not all obsidian and not all glass are created the same.
As suggested in another post I tried a small diamond blade on my Dremel a few nights ago and found that it cuts it like butter and no chipping on edges. You get less waste than your tile saw would create. I know I`ll use mine for it again when needed. The blades are pretty inexpensive too for the Dremel.
Post by susand24224 on Jul 21, 2011 0:36:01 GMT -5
Overall I agree with Steve--many variables between glass and obsidian. That being said, I just tumbled some glass and obsidian and the variables worked out in my favor--both tumbled and polished nicely. I remember reading that glass can be as low as Mohs 5 in hardness and obsidian is 6-6.5 so it seems that if anything goes wrong it will be with the glass. This is just a *slightly* educated guess, though
drocknut: The weather guessers are predicting possible triple digit temperatures by the weekend here which is way too hot for here. I'm not going to be a happy lady if I have to work in the heat.
Jun 25, 2015 23:02:24 GMT -5
Fossilman: As of today we are busting the triple digits too,been the high 90's for a few days..Going to be some record breakers this summer..
Jun 26, 2015 9:20:30 GMT -5
mr.mohs: it to hot to rock that's the worse of it- otherwise stay cool by posting on RTH with all my rock pals...mostly
Jun 26, 2015 11:45:44 GMT -5
snowmom: 48 degrees here at 4:57 AM, high of 72 predicted for the day. you all come hang out here any time you want!
Jun 28, 2015 3:58:46 GMT -5
drocknut: Snowmom I'm on my way
Jun 28, 2015 7:44:43 GMT -5
mr.mohs: it 72 degrees & 5 o'clock somewhere in the world at all times...but the odds are against for awhile here... mostly
Jun 28, 2015 13:12:25 GMT -5
Fossilman: I'm ready for some 60 degree weather-hell with this hot crap!!!!
Jun 29, 2015 9:44:01 GMT -5
mr.mohs: ouchiemama! I just picked up a plastic bag of rocks and a chunk of gem silicia just smashed by big toe!
Jun 29, 2015 17:07:54 GMT -5
jakesrocks: LOL. Cut its heart out Ed.
Jun 29, 2015 20:00:11 GMT -5
mr.mohs: Luckily what I was looking for wasn't in the bag. A chunk of B.I.F. Higher specific gravity...
Jun 29, 2015 22:34:35 GMT -5