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Identity HelpUnknown on smoky quartz
21st Sep 2018 00:17 UTCtodd Van Duren
My first thought was adamite based on crystal morphology, but the association seems wrong. Second guess is perhaps stilbite. The luster is certainly suggestive of stilbite or heulandite.
The quartz itself is rather distinctive. Primary quartz crystal has been partially covered by a thin layer of a greenish-white material, which has partially healed over with another layer of quartz. The yellow unknown appears to have formed after the final layer of quartz and grows on top of both the healed quartz and the greenish-white material.
Any thoughts on ID or locality would be much appreciated.
21st Sep 2018 00:46 UTCRuss Rizzo Expert
The larger crystals are stilbite. I'm not sure about the greenish-white material. Getting the location for the specimen will be helpful.
Russ
21st Sep 2018 00:54 UTCtodd Van Duren
> Getting the
> location for the specimen will be helpful.
No suggestions? Mindat searches are drawing a blank.
21st Sep 2018 01:03 UTCIan Nicastro
21st Sep 2018 01:28 UTCRuss Rizzo Expert
21st Sep 2018 01:51 UTCtodd Van Duren
21st Sep 2018 02:03 UTCRuss Rizzo Expert
Edit: Memory can be poor sometimes... it was chabazite & laumontite.
21st Sep 2018 02:22 UTCKevin Conroy Manager
21st Sep 2018 02:36 UTCtodd Van Duren
-------------------------------------------------------
> Wouldn't it be interesting if the white crystals
> were bertrandite?
Are you referring to the fine acicular crystals? I assumed natrolite or some other zeolite, >if< the yellow mineral is indeed stilbite (sp).
I have yet to look at the specimen under anything but 10x.
21st Sep 2018 02:57 UTCKevin Conroy Manager
21st Sep 2018 11:19 UTCJohan Kjellman Expert
21st Sep 2018 15:10 UTCUwe Kolitsch Manager
21st Sep 2018 16:38 UTCtodd Van Duren
I must say the photos of Strzegom material does look very similar. The morphology of the quartz, the color of the stilbite, the assemblages. I'd be more likely to believe Strzegom than 'Tibet', despite the fact the specimen came from a Chinese dealer.
21st Sep 2018 16:47 UTCtodd Van Duren
21st Sep 2018 17:33 UTCA. M.
22nd Sep 2018 06:25 UTCV. Stingl
22nd Sep 2018 15:37 UTCtodd Van Duren
We do live in a global economy and things do have a tendency to filter around.
This piece in particular appears to have been a one-off in the dealer's offerings. One can imagine myriad ways a singular curious but generally ugly specimen might migrate from hand to hand around the planet. Pity minerals don't come with passports.
Considering the morphology of the quartz and the general assemblage of the piece, I still think Strzegom is a more likely source.
At the very least it has been a fun little puzzle for $2.25US.
23rd Sep 2018 00:41 UTCRuss Rizzo Expert
I don't think your specimen is from Poland. I believe it is from China.
Click on this link & this link
Russ
23rd Sep 2018 01:24 UTCKevin Conroy Manager
23rd Sep 2018 02:00 UTCRuss Rizzo Expert
23rd Sep 2018 05:47 UTCtodd Van Duren
I really don't think it's mimetite. The cross-section is distinctly orthorhombic or tetragonal; there is absolutely no suggestion of hexagonal symmetry.
Russ, thanks for the link. Pity the mindat page for Tongbei is not more fleshed out. Pity too the images on Chino Neolithic page aren't a bit sharper
and color balanced. Is this your page? If you have handled these specimens, what would you make of the accessory minerals on my piece? What is
the acicular mineral on this piece: http://www.chinaneolithic.com/en/stores/view.asp?id=610
Yes, it would be great to have this piece analyzed. Unfortunately I don't have direct access to anything more than mineralogy texts, a loupe, experience
and a few chemicals. It will have to go into the 'to have analyzed' pile along with a few other things that need identification, (uranium unknowns from
the Congo, etc.)
23rd Sep 2018 06:16 UTCRuss Rizzo Expert
I have no affiliation with China Neolithic. I just did a quick internet search and they were the first of many that came up.
Tongbei doesn't ring a bell as far as the location. My memory tells me that it was Chenzou, but I'm not certain that is where mine were from. And I wouldn't be 100% sure about your specimen or others on the internet. I've been fed a lot of misinformation over the years from Chinese dealers. Afghani & Pakistani too. Mostly,I think, to misdirect others who might also want to exploit what has been found.
The 2 specimens that I had were only in my possession about a week or so at Tucson in 2009 or 2010.
My guess on your white acicular crystals, and only a guess, are that they are laumontite. If you can remove a few of the crystals from a spot on your specimen that won't be noticed, you can test for laumontite by trying to dissolve it in a small amount of HCL. If it is laumontite it will form a gel.
Russ
23rd Sep 2018 19:46 UTCKevin Conroy Manager
Russ, I was just trying to get a bit more data on the crystals. Sometimes it's hard remembering past finds/crystals when they're not from larger documented finds. I also think you're right on about the white crystals being laumontite.
24th Sep 2018 01:35 UTCtodd Van Duren
25th Sep 2018 09:48 UTCRuss Rizzo Expert
-------------------------------------------------------
...Sometimes it's hard remembering
> past finds/crystals when they're not from larger
> documented finds.
Sometimes its hard enough just remembering and it ain't getting any easier with age.
20th Nov 2018 00:58 UTCRuss Rizzo Expert
Found a picture of one of the specimens that passed through my hands.
It turns out that Chenzhou is the correct locality for these specimens. Wish I had a more accurate locality than that. But it is better than nothing at all.
Cheers,
Russ
11th Feb 2019 13:21 UTCEligiusz Szełęg Expert
Your samle looks like Strzegom smoky quartz with stilbite-(Ca) and laumontite
regards
Elek
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Privacy Policy - Terms & Conditions - Contact Us / DMCA issues - Report a bug/vulnerability Current server date and time: April 25, 2024 06:36:13