reiver1
off to a rocking start
Member since October 2004
Posts: 14
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Post by reiver1 on Oct 19, 2004 12:09:12 GMT -5
As a firm believer that the only stupid question is the one you don't ask; ;D
Is it OK to mix different rocks in a load if they are within a point or 2 on the Moh's scale?
Thanks, Eric
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Post by Toad on Oct 19, 2004 12:35:21 GMT -5
The closer the better. Be aware that the softer rock will shrink much faster.
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reiver1
off to a rocking start
Member since October 2004
Posts: 14
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Post by reiver1 on Oct 20, 2004 2:45:03 GMT -5
Thanks, Toad.
ERic
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AgateHunter
starting to spend too much on rocks
LAKE SUPERIOR AGATE Minnesota State Gemstone
Member since September 2004
Posts: 107
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Post by AgateHunter on Oct 20, 2004 22:46:40 GMT -5
Eric, The worst that could happen is the softer rocks might not polish.
If that happens, set them aside until you have enough to fill a batch, and re-polish.
Chris
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Post by docone31 on Oct 20, 2004 22:58:02 GMT -5
I toss softer rocks all the time. I sometimes use the corundum/ruby, saphire to help with the tumble. Go ahead and run what ya brung, just check once in a while. Some pieces you might want to cull and run seperately.
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Post by cookie3rocks on Oct 20, 2004 23:11:46 GMT -5
Eric,The closer, the better. Doc, I ran some corudum as fill with some quartz and I think it beat the quartz up pretty bad, or maybe it was bad quartz to start with. Anyway, I don't do that any more. The load I'm running now is within 1 on the mohs scale and it's all coming along really well. Better safe than sorry, if you have a choice. ;D
cookie
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Post by Al on Oct 21, 2004 1:13:28 GMT -5
To tumble rocks do you need to know how hard the rocks are? Things are starting to look more complex now. how do you do the mow scale?
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reiver1
off to a rocking start
Member since October 2004
Posts: 14
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Post by reiver1 on Oct 21, 2004 5:50:45 GMT -5
Al, the Moh's Hardness scale is the one you learned in high school earth science. 10 minerals graded by which one will scratch others. Here's a link: www.24carat.co.uk/hardnessmohsscaleframe.htmlclick on any mineral name and among the info is the hardness. Eric
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Post by sandsman1 on Oct 21, 2004 7:01:56 GMT -5
hi all take alook at this
Based on Mohs Scale of Hardness
Scratching tools: fingernail (2.2) copper penny (3.5) pocket knife or common nail (5.2) piece of glass (5.5) steel file or concrete nail (7.5) piece of corundum (9)
Notes for testing:
Each mineral can scratch the minerals with lower hardness ratings. Each mineral can scratch itself. Don’t press hard, normal scratching should do. Weathered surfaces are softer. Corners or edges of crystals are softer. Small pieces seem softer than large pieces. When you scratch, take a close look at the scratch line - which often looks white. Iis it really a scratch or is it a powder line made from the tool you used because it was softer than the item you were trying to scratch.
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stubby
starting to spend too much on rocks
Member since April 2004
Posts: 150
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Post by stubby on Oct 21, 2004 11:00:52 GMT -5
My experience is that I can get by with mixed MOH's in 60/90, but get in more trouble as I get into finer grit.
Stub
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birdseed
starting to spend too much on rocks
Member since September 2004
Posts: 167
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Post by birdseed on Oct 21, 2004 13:19:53 GMT -5
I throw in sodalite all the time--I just take it out earlier..Try this--> throw in some limestone--LOL
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Post by Al on Oct 23, 2004 14:06:24 GMT -5
Thanks for the moh scale. I'm in my first year of hs and taking bio next year will take earth science and i'm sure i will get an A after learning all these stuff. Al
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