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Lapidary / Gemstone Community Forum
January 21, 2019, 09:44:33 am
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Can't shake the Rhodonite !

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Author Topic: Can't shake the Rhodonite !  (Read 91 times)
Taogem
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« on: November 25, 2018, 01:08:48 am »

Seems like rhodonite just continues to be a hot topic !

Found this slab that is completely different from any rhodonite I have seen or cabbed. Really dark in comparison.

No idea how a cab will look..


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SSA
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« Reply #1 on: November 25, 2018, 04:16:48 pm »

Have you finished it yet??
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Robert
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« Reply #2 on: November 25, 2018, 06:29:08 pm »

No.. I have a couple of others that want to finish first.

Probably will not get to this until next week.
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« Reply #3 on: November 25, 2018, 07:21:40 pm »

Next week??

You are such a tease
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Robert
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« Reply #4 on: November 25, 2018, 07:39:33 pm »

Next week??

You are such a tease

 lol  Yes, I am at the mercy of our local rock club hours.. They open three days a week for 3 to 4 hours each day..
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mick B
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« Reply #5 on: November 26, 2018, 12:38:29 am »

George, did you give the face of this slab a sand, rhodonite oxidizes very fast, it can go brown very fast several days after cutting, I have some that is black months after I cut.
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Taogem
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« Reply #6 on: November 26, 2018, 05:48:14 am »

George, did you give the face of this slab a sand, rhodonite oxidizes very fast, it can go brown very fast several days after cutting, I have some that is black months after I cut.


Interesting.. No, I have not, but will give it a try tonight and let you know..


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« Reply #7 on: November 27, 2018, 05:00:48 am »

George, did you give the face of this slab a sand, rhodonite oxidizes very fast, it can go brown very fast several days after cutting, I have some that is black months after I cut.


Well, it was the same color throughout... :)
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« Reply #8 on: November 27, 2018, 07:25:47 am »

George, did you give the face of this slab a sand, rhodonite oxidizes very fast, it can go brown very fast several days after cutting, I have some that is black months after I cut.


Mick - any idea what causes the oxidation?  I have some cabs I cut years ago that look the same now as when I cut them
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Robert
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« Reply #9 on: November 27, 2018, 09:07:49 pm »

I assume it is manganese that oxidises forming manganese oxide, most the rhodonite boulders I have seen in the rough have a crust of black manganese oxide with a rhodonite core (or often just a blob of solid manganese oxide). The rhodonite can oxidise very quickly when broken open with a hammer or slabbed, for some reason polishing a piece seems to prevent the oxidisation process.
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« Reply #10 on: November 28, 2018, 11:24:09 am »

Pretty cool info - thanks!
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« Reply #11 on: November 28, 2018, 02:50:29 pm »

I think Southerly is spot on with his description, mind you I do have some slabs that have not done this at all but others that have turned completely black or a dark brown over a few weeks, a before and after picture, sanded on 220 grit diamond by hand today.


* rh1.jpg (362.73 KB, 796x572 - viewed 1 times.)

* rh2.jpg (379.3 KB, 760x581 - viewed 2 times.)
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