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Never seen anything like this. Seems to cool to be real?

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wpotterw
spending too much on rocks

Member since September 2016
Posts: 446

Never seen anything like this. Seems to cool to be real? Mar 22, 2020 8:47:55 GMT -5 RocksInNJ likes this

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Post by wpotterw on Mar 22, 2020 8:47:55 GMT -5

www.ebay.com/itm/5-11LB-Rare-Authentic-green-Blue-Obsidian-Volcanic-on-matrix-raw-Glass-Stone/193380469078?_trkparms=aid%3D555018%26algo%3DPL.SIM%26ao%3D1%26asc%3D225086%26meid%3Dcaf094ac39464f64b4ad5aa5772562ab%26pid%3D100012%26rk%3D7%26rkt%3D12%26sd%3D324104226030%26itm%3D193380469078%26pmt%3D1%26noa%3D0%26pg%3D2047675%26algv%3DSimplAMLv5PairwiseWeb&_trksid=p2047675.c100012.m1985

hummingbirdstones
misunderstood rock expert

Member since October 2017
Posts: 14,135

Never seen anything like this. Seems to cool to be real? Mar 22, 2020 9:25:58 GMT -5 MsAli and RocksInNJ like this

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Post by hummingbirdstones on Mar 22, 2020 9:25:58 GMT -5

See the discussion at this link:

Mindat.org

Almost certainly slag glass.

Robin

"Of all tyrannies, a tyranny sincerely exercised for the good of its victims may be the most oppressive. It would be better to live under robber barons than under omnipotent moral busybodies. The robber baron's cruelty may sometimes sleep, his cupidity may at some point be satiated; but those who torment us for our own good will torment us without end for they do so with the approval of their own conscience."

-- C.S. Lewis

wpotterw spending too much on rocks Member since September 2016 Posts: 446	Never seen anything like this. Seems to cool to be real? Mar 23, 2020 6:59:58 GMT -5 Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by wpotterw on Mar 23, 2020 6:59:58 GMT -5 Thanks. Thought it was too good to be true.

RickB
gets rocks for Christmas

Member since May 2010
Posts: 5,754

Never seen anything like this. Seems to cool to be real? Mar 23, 2020 7:56:22 GMT -5 RocksInNJ likes this

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Post by RickB on Mar 23, 2020 7:56:22 GMT -5

I have two similar pieces of this that a friend/rock dealer gave to me a few years ago. He said that it came from Afa, Ethiopia. Had some white inclusions so he called it a clear green snowflake obsidian. I believe it is now being called elmerite. To me it looks like a slag glass.

Last Edit: Mar 23, 2020 8:19:22 GMT -5 by RickB

Deleted
Deleted Member

Member since January 1970
Posts: 0

Never seen anything like this. Seems to cool to be real? Mar 23, 2020 11:47:50 GMT -5 RickB and RocksInNJ like this

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Post by Deleted on Mar 23, 2020 11:47:50 GMT -5

Mar 23, 2020 7:56:22 GMT -5 RickB said:

To me it looks like a slag glass.

Yup, your instinct is correct. I've seen this type of slag being marketed as "obsidian" and "all natural" under tens of names (e.g., "Andara obsidian") - mostly out of China and Indonesia, though slag glass can come from anywhere. Natural obsidian comes in a few colors + sheen types, but none of them are transparent with bright color (except for some with a brownish-gray color when backlit or in thin section). Volcanos don't spit out pure materials like that (there is a long period of mixing and picking up of other minerals on the way to being extruded onto the surface).

pebblesky
driving up their electric bill

Purchased another UV mini bowl for tumbling

Member since September 2022
Posts: 2,164

Never seen anything like this. Seems to cool to be real? Jan 24, 2024 17:57:27 GMT -5 RickB and rockjunquie like this

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Post by pebblesky on Jan 24, 2024 17:57:27 GMT -5

Mar 23, 2020 7:56:22 GMT -5 RickB said:

Just came across this post. I recently had to tell people these are not "Brazilian Green Crystal".

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Never seen anything like this. Seems to cool to be real?

Post by wpotterw on Mar 22, 2020 8:47:55 GMT -5

Post by hummingbirdstones on Mar 22, 2020 9:25:58 GMT -5

Post by wpotterw on Mar 23, 2020 6:59:58 GMT -5

Post by RickB on Mar 23, 2020 7:56:22 GMT -5

Post by Deleted on Mar 23, 2020 11:47:50 GMT -5

Post by pebblesky on Jan 24, 2024 17:57:27 GMT -5

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