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Offline racedaddyTopic starter
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« on: January 14, 2010, 11:30:19 am »
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Here are two large garnets I found years ago.

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Offline BitburgAggie_7377
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« Reply #1 on: January 14, 2010, 11:38:13 am »
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Nice sized stones.   Is it me, but are those different varieties of garnet?  If so, can you tell us which is which?

Thanks

BA

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« Reply #2 on: January 14, 2010, 01:21:52 pm »
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Yes, they do look different, I also would like to know what kind they are! Smiley

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Offline racedaddyTopic starter
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« Reply #3 on: January 14, 2010, 03:56:07 pm »
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I could not tell you, I just know there garnets. They have fractures in them, so there not worth cutting. I plan on polishing the one to see the color better.

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Offline Figgy
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« Reply #4 on: January 14, 2010, 04:09:53 pm »
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They make nice specimens anyway! Smiley

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« Reply #5 on: February 04, 2010, 12:36:15 pm »
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have a couple of pounds of garnets I found while pannjing in Vermont. Want to polish them up to see the calour better. most are an 1/8 to 1/4 inch. Thought I would put them in a tumbler, any thoughts on grit size or type?

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Offline racedaddyTopic starter
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« Reply #6 on: February 05, 2010, 12:09:38 pm »
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I know that using the tumbler will work, but I don't know what size grit to use.

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« Reply #7 on: February 05, 2010, 12:31:00 pm »
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Quote:Posted by drpepper
have a couple of pounds of garnets I found while pannjing in Vermont. Want to polish them up to see the calour better. most are an 1/8 to 1/4 inch. Thought I would put them in a tumbler, any thoughts on grit size or type?


We found several pound a few years ago in a creek put them in tumbler 400 grit for a week 600 for a week 1200 one week then polish. If I had more would go 600 for a few days then 1200 for a week polish works for me. I did have a guy at a gem show tell me if they were creek tumbled just use a pre-polish then polish

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« Reply #8 on: February 05, 2010, 04:04:15 pm »
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re; your photograph

racedaddy, the one on the left looks to me like a ruby I found a few years ago in the Smoky Mountains, the one on the right looks like a rare form of corundum. a mineral variety of ruby. Wiki those two minerals and you will see them listed together. Don't look at the crystal shapes, these minerals take several shapes. Some books separate corundum and ruby or lump garnet, ruby and corundum together. Try scratching them with a quartz crystal. If they don't  scratch they very likely are Ruby and corundum. (Ruby is harder than quartz and garnet is about the same as quartz) If they do scratch they could be garnet. Gambol1   Wise

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« Reply #9 on: March 28, 2010, 01:45:57 am »
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They are indeed garnets. I've chiseled out a few similar to the red (right) one from a quartz vein in Colorado. I doubt they are any form of ruby - ruby and sapphire are both the gem form of the mineral corundum which has a hardness of 9, and has a bipyramidal, not a rhombic dodecahedra crystal shape (like these).
 
Anyways, a great resource on garnets is the wikipedia article:

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My guess would be that the left, black garnet is of the Andradite variety, since it seems to be on a schist-like matrix and is one of the few types that can be black. The left could be any of three main varieties, but I'd guess Pyrope or Spessartine. If you had any idea what host rock they came from, that could be a major clue to the type.

Cheers~ Smiley



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