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Judith Chen
Joined: 01 Feb 2011
Posts: 10
Location: Oxford
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Posted: Aug 14, 2011 04:57 Post subject: Jade |
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Good morning
Can anyone provide any advice on purchasing jade and how I one can you tell if the piece you are interested in is the real thing and not another product that has been dyed and made to look like jade?
Any advice most welcome.
Thank you for reading my post
Judith
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John S. White
Site Admin
Joined: 04 Sep 2006
Posts: 1295
Location: Stewartstown, Pennsylvania, USA
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Posted: Aug 14, 2011 05:08 Post subject: Re: Jade |
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Jades, there are two main types - nephrite and jadeite, are very complex materials and learning all about them requires a lot of effort and time. It is not easy to tell jades from other materials that resemble them, and it may not be easy to tell is a sample has been dyed or otherwise treated. However, there are many good books on the subject easily found. When buying jade the best bet is to deal with a responsible dealer and obtain certification, if possible.
_________________ John S. White
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mihailovici79
Joined: 07 Sep 2011
Posts: 111
Location: Timisoara
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Posted: Sep 08, 2011 09:33 Post subject: Re: Jade |
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Hello, if you like you can see in my blog, jade from Romania. I found it for the first time in Romania.I have also a collection of rocks and minerals and fossils. Visit:
https://rocimineralefosile-banat.blogspot.com/
(link normalized by FMF)
and tell me if you like it. Thank you.
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mihailovici79
Joined: 07 Sep 2011
Posts: 111
Location: Timisoara
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Posted: Sep 13, 2011 12:10 Post subject: Re: Jade |
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After processing...
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lingxiaoxiao
Joined: 01 Nov 2011
Posts: 1
Location: Erlangen
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Posted: Nov 02, 2011 10:46 Post subject: Re: Jade |
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Hello,mihailovici79
I like you samples very much . and I have a question. what kind of jade do your samples belong to? Nephrite or Jadeite?
Best Wishes
Ling
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mihailovici79
Joined: 07 Sep 2011
Posts: 111
Location: Timisoara
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Posted: Nov 02, 2011 11:22 Post subject: Re: Jade |
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The above is Jadeite, but I found a harder variety of dark green, 7 Mohs hardness.
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cascaillou
Joined: 27 Nov 2011
Posts: 251
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Posted: Nov 27, 2011 11:06 Post subject: Re: Jade |
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In my eyes, this doesn't look like jadeite. Have you accurately measured the specific gravity?
Could be massive vesuvianite or serpentine
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mihailovici79
Joined: 07 Sep 2011
Posts: 111
Location: Timisoara
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Posted: Nov 27, 2011 12:26 Post subject: Re: Jade |
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Yeah is much harder like serpentine and it have close hardness of cuartz. One expert from Geological Institute Bucarest said that is a variety of jade. Look other kind of jade.
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cascaillou
Joined: 27 Nov 2011
Posts: 251
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Posted: Nov 27, 2011 14:04 Post subject: Re: Jade |
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If hardness is close to quartz, that might still be vesuvianite, measuring specific gravity would help identifying it.
Is it actually mined in romania?
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alfredo
Site Admin
Joined: 30 Jan 2008
Posts: 981
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Posted: Nov 27, 2011 15:45 Post subject: Re: Jade |
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Judith and Mihailovici, A couple years ago there was a period when a lot of repetitive jade-related questions were surfacing on Mindat, so I wrote a brief article answering some of these questions: https://www.mindat.org/article.php/883/Jade
Much of this you probably already know, but I hope you might find a few more bits of useful information.
Best wishes,
Alfredo
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mihailovici79
Joined: 07 Sep 2011
Posts: 111
Location: Timisoara
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Posted: Nov 27, 2011 16:20 Post subject: Re: Jade |
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No its just find by me. Have specific gravity 2.86. (Have 886 g in air and 576g in water).
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mihailovici79
Joined: 07 Sep 2011
Posts: 111
Location: Timisoara
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Posted: Nov 27, 2011 16:22 Post subject: Re: Jade |
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mihailovici79 wrote: | No its just find by me. It has specific gravity 2.86. (it has 886 g in air and 576g in water). | and first piece has 192 g in air and 125g in water.
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Judith Chen
Joined: 01 Feb 2011
Posts: 10
Location: Oxford
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Posted: Nov 28, 2011 02:49 Post subject: Re: Jade |
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Alfredo
Thanks so much for posting the link and referring me to your article on Mindat. Your article was really informative and given me lots of food for thought.
Many thanks and best wishes
Judith
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mihailovici79
Joined: 07 Sep 2011
Posts: 111
Location: Timisoara
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Posted: Nov 28, 2011 10:50 Post subject: Re: Jade |
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Alfredo thank u for post.
Mihail
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cascaillou
Joined: 27 Nov 2011
Posts: 251
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Posted: Nov 28, 2011 10:58 Post subject: Re: Jade |
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Mihailovici, concerning your rock, can it be scratched by a piece of glass? also, does it scratch glass?
according to the specific gravity it could be serpentinite (a rock mainly composed of serpentine group minerals) or nephrite (amphibole group).
Maw-sit-sit aka jade-albite (a rock mainly composed of kosmochlor mixed with some jadeite and other minerals) also fits the SG but it doesn't really look like it.
One thing for sure, it isn't jadeite and it isn't vesuvianite.
There was an interesting jade discussion on gemologyonline(dot)com which included an valuable quote from the book 'The Jade Enigma':
In defining both jadeite and nephrite, texture is as important as mineralogical composition. The material must be tough, compact, and fine grained.
In the case of nephrite, it must consist of fine interlocking fibers. If the fibers are not interlocking, but simply parallel or sub parallel, the material lacks the necessary toughness and therefore can not be considered nephrite.
The author defines jade as any member of the pyroxene or amphibole group that possesses the necessary textural characteristics to impart toughness, as well as commonly accepted refractive index and specific gravity of jadeite/nephrite.
Note that nephrite has a fibrous structure while jadeite has a granular structure.
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mihailovici79
Joined: 07 Sep 2011
Posts: 111
Location: Timisoara
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Posted: Nov 28, 2011 12:27 Post subject: Re: Jade |
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Thanks for information. I read also the Mindat post. Indeed it`s very difficult to break the stone with my hammer. I have an very hard hammer.
Yeah, I scratch my wife`s mirror with this piece. I hope she doesn't see that scratch cuz I`m fucked. :). I made this pyramid ;). I'm interested for jade too, especially as I discovered the location with jade in Romania and there is enough jade (nephrite)
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jade pyramid 136g 40x40x36 mm |
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cascaillou
Joined: 27 Nov 2011
Posts: 251
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Posted: Nov 28, 2011 23:18 Post subject: Re: Jade |
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glass hardness is 5 to 6 (usually 5.5), so if your stone scratches glass, that means it is hardness 5 or higher.
nephrite hardness is 5.5 to 6.5
serpentine hardness is usually 2.5 to 4 but some can be as high as 4 to 5.5 (bowenite)
the best way to make sure would be to place a tiny polished piece of the mineral (with flat and smooth facet) on a refractometer, as serpentines RI range is quite different from nephrite RI range. I can do that for you if you want.
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mihailovici79
Joined: 07 Sep 2011
Posts: 111
Location: Timisoara
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Posted: Nov 29, 2011 10:47 Post subject: Re: Jade |
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Thanks. Where are you from? We can talk about this. If you visit my blog you can see more details.
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cascaillou
Joined: 27 Nov 2011
Posts: 251
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Posted: Nov 29, 2011 12:10 Post subject: Re: Jade |
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Well that's up to you, it's only if you're interested in idenifying your stone more precisely.
A tiny 4 millimeters sized sample would be more than enough for this purpose, but it would have to be perfectly polished, meaning that it needs to have a perfectly flat facet cut (not curved) with a very smooth surface. You would have to do the cutting and polishing as I haven't got the tools to do it myself.
By the way, don't send me anything bigger, because I won't send it back to you: once I'm finished with the analysis, I will just discard the sample (so a 4 mm sized granule is all I would need, don't send anything of any value so I don't need to send it back)
As that would be a very small sample, you could send it in a simple envelope. I'm in France.
I can't be sure I will succeed in getting a refractive index from the sample, that depends on the polishing, I'm not a jade expert but I can try and if I can get any results I would report on the forum.
Otherwise, the easiest way to go would be to bring a small polished piece to a jeweller near where you live, and ask him if he could measure the RI for you.
EDIT: I just visited your website, I can see that many of your stones are labelled as serpentine, so you actually know what they are?
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mihailovici79
Joined: 07 Sep 2011
Posts: 111
Location: Timisoara
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Posted: Nov 29, 2011 13:45 Post subject: Re: Jade |
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Yeah.I`m working very much with serpentine and jade for jewelry and decorative objects.
Regarding the rock sample can be solved because my sister is a student in Clermont and I`ll send you a piece of jade. Thank u again
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