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
mr.mohs: amanda1982 be sure to post an introduction and your question in the VISITOR & GUEST section. I'm sure RTH will be one stop source of invaluable info
Aug 26, 2014 20:46:37 GMT -5
mr.mohs: I was jus think that super volcano would be such cataclysmic advent on the earth vunerable area would slide into the sea
Aug 26, 2014 20:48:02 GMT -5
nowyo: Probably not, Ed, the faults in CA aren't working that way. SoCal will continue it's slow march to the NW and become an offshore chain of islands in oh, 20 or 30 million years. If/when Yellowstone caldera blows we'll have time to say "oh s$#@.
Aug 26, 2014 22:12:02 GMT -5
mr.mohs: so if that sucker blows... none of us will be around to gloat : see I told you so?
Aug 27, 2014 1:02:50 GMT -5
arago: Hey Jugglerguy, I just followed your directions and am washing my rocks (for the first time ever!)in Dawn. Next comes the Borax...
Aug 27, 2014 20:34:48 GMT -5
arago: Wait, what? Did I just jump into a super volcano blow in Yellowstone and a tectonic drift discussion? [pours another glass of Cabernet...]
Aug 27, 2014 20:37:03 GMT -5
arago: Like I said, newb is trying to wash off the residue from his first tumbler run.
Aug 27, 2014 20:38:28 GMT -5
arago: Back to the discussion.
Aug 27, 2014 20:38:44 GMT -5
Fossilman: amanda1982....Go to Kingsley North.com,they are full of goodies and its a one stop store for all your tumbling and hounding needs...
Aug 28, 2014 8:54:45 GMT -5
catmandewe: The volcano at yellowstone finally blew?
Aug 28, 2014 15:29:49 GMT -5
rockpickerforever: Tony, if it did, I think you'd already know about it... Maybe next week.
Aug 28, 2014 15:47:51 GMT -5
Fossilman: Na',it just farted......That place has been burpin' for years though...I think we are lucky it has...
Aug 28, 2014 17:07:55 GMT -5
Fossilman: Would love to see what's underneath that place!!!!!!
Aug 28, 2014 17:08:34 GMT -5
nowyo: Just bought an 18 inch Highland Park saw tonight. Oh, woe is me. What will be the next fix for this junkie?
Aug 28, 2014 23:26:20 GMT -5
rockpickerforever: Oh, you got it bad, Russ. Do you get the DTs when you don't get out and cut rocks on a regular basis? Not the worst thing in world. I have shown great self restraint, 10" HP trim saw largest I have. It makes for a good excuse, can't saw those big rocks.
Aug 29, 2014 0:44:13 GMT -5
wampidy: Jean, I think you should call it "don't have to lift those big rocks". My 12 is good for me also. The one big rock that I cut in Tony's saw in Quartzsite was way too much for me.(only 54 lbs) I am thinking motorcycle lift and rolling them in.
Aug 29, 2014 11:02:47 GMT -5
rockpickerforever: Jim, you know what they say about good things coming in small packages? I'd like to think I have every bit as good a chance to find winners in the smalls, and not have to deal with the big ones. Lifting heavies not good for old backs.
Aug 29, 2014 11:30:36 GMT -5
Shotgunner: hmmm.... good to know Jim has a 12" saw. Must remember for future discussions.....
Aug 29, 2014 22:30:25 GMT -5
Shotgunner: Ohhh!!! Russ has an 18"!! wooohooo!!
Aug 29, 2014 22:30:43 GMT -5
nowyo: Yeah, I do. Got it home tonight. It was in the cellar of a farmhouse. Had to mostly disassemble it to get it through the door and up the stairs. The things we do for fun. I'll put it back together tomorrow night. Bet it hasn't been used in 30 yrs.
Aug 29, 2014 23:01:19 GMT -5