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Looking for Hard to find stones https://www.gemologyonline.com/Forum/phpBB2/viewtopic.php?f=20&t=24910 |
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Author: | Isi [ Sun Jan 13, 2019 7:49 am ] |
Post subject: | Re: Looking for Hard to find stones |
How about a nice vanadium chrysoberyl, and of course a cobalt spinel from Vietnam, but with affordable prices. These are hard to find !!! |
Author: | Marlow [ Sun Jan 13, 2019 9:05 am ] |
Post subject: | Re: Looking for Hard to find stones |
Isi wrote: How about a nice vanadium chrysoberyl, and of course a cobalt spinel from Vietnam, but with affordable prices. These are hard to find !!! No, I have enough... |
Author: | Marlow [ Sun Jan 13, 2019 9:15 am ] |
Post subject: | Re: Looking for Hard to find stones |
On my colored stones list: red and/or blue Taaffeite, red Musgravite FCD list a fancy blue(ish)-green or green(ish)-blue intense or vivid diamond. So expensive... I am so modest. |
Author: | Isi [ Sun Jan 13, 2019 3:50 pm ] |
Post subject: | Re: Looking for Hard to find stones |
I have both of them : a vivid blue an a green one Oh, did you mean naturally colored, nor irradiated ? This is a different story. There is only one solution : |
Author: | Marlow [ Mon Jan 14, 2019 5:05 am ] |
Post subject: | Re: Looking for Hard to find stones |
Yes, natural untreated.... So only a tiny one with a few points... |
Author: | Nick_G [ Sun Jan 27, 2019 1:33 pm ] |
Post subject: | Re: Looking for Hard to find stones |
dchallener wrote: I am also looking for some of that Vietnamese transparent "Amazonite". Or there's the similar mint-green transparent oligoclase from Kenya/Tanzania. AFAIK this is very rare but not too expensive. I have a chunk of rough that shows obvious pleochroism from bluish-green to yellowish green. |
Author: | Barbra Voltaire, FGG [ Sun Jan 27, 2019 8:10 pm ] |
Post subject: | Re: Looking for Hard to find stones |
I'd love to see a picture of that rough. Please post it. |
Author: | Stephen Challener [ Mon Jan 28, 2019 12:52 am ] |
Post subject: | Re: Looking for Hard to find stones |
The pale green stuff from Tanzania is often sold as sunstone, though much of it has a slightly murky tone to it. I have some pale rough somewhere which I picked out from a cab parcel, waiting to be faceted. Apparently there was some spectacular material from Canada at some point, according to the GIA's documentation of the Gubelin collection: Though who knows if there was ever more than just the one, he was apparently pretty good at tracking down real rarities. |
Author: | Nick_G [ Mon Jan 28, 2019 4:17 pm ] |
Post subject: | Re: Looking for Hard to find stones |
Barbra Voltaire wrote: I'd love to see a picture of that rough. Please post it. Here you go Barbra: This piece is about 35 mm by 24 mm and about 17-19 mm thick. The weight is about 25 grams. |
Author: | Isi [ Tue Jan 29, 2019 7:03 am ] |
Post subject: | Re: Looking for Hard to find stones |
Impressive pleochroism indeed ! Especially for a pale stone. I wonder what it would look like if it were cut ? |
Author: | Nick_G [ Tue Jan 29, 2019 4:09 pm ] |
Post subject: | Re: Looking for Hard to find stones |
Isi wrote: Impressive pleochroism indeed ! Especially for a pale stone. I wonder what it would look like if it were cut ? Thanks Isi. The pleochroism is very pronounced using the LCD monitor as a source of polarised light. See below: |
Author: | Barbra Voltaire, FGG [ Tue Jan 29, 2019 6:10 pm ] |
Post subject: | Re: Looking for Hard to find stones |
Holy guacamole! Are you quite sure this is feldspar. |
Author: | Nick_G [ Tue Jan 29, 2019 6:31 pm ] |
Post subject: | Re: Looking for Hard to find stones |
Barbra Voltaire wrote: Holy guacamole! Are you quite sure this is feldspar. Yes. The base has the typical striations as a result of repeated lamellar twinning. Another pic illustrating this: I actually bought this specimen about 8 years ago at a mainstream crystal shop in Salisbury. This was something out-of-the-ordinary as I've never seen anything like it for sale since, even at the Kempton Park Rock & Gem shows. |
Author: | Stephen Challener [ Fri Feb 15, 2019 11:18 pm ] |
Post subject: | Re: Looking for Hard to find stones |
This tucson I picked up a crystal of feldspar (raman scan best matches albite, so likely at least plagioclase rather than k-spar of some sort) with very blue zones. It was mixed into a parcel of Madagascar sanidine. I've seen blue cleavlandite before but never this gemmy or this blue. I also saw some of the classic 'masai sunstone' priced not that awful and some light blue oligoclase, priced who knows but given the seller definitely high I also found my baggie of green facet rough pulled from a parcel of cab-grade Masai sunstone. Small and mostly pale, but worthy. |
Author: | Barbra Voltaire, FGG [ Fri Feb 15, 2019 11:57 pm ] |
Post subject: | Re: Looking for Hard to find stones |
Oh! I like that Masai sunstone....where does it come from and does it have anything to do with the Masai? |
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