We use cookies to show content based on your preferences. If you continue to browse you accept their use and installation. More information. >

FMF - Friends of Minerals Forum, discussion and message board
The place to share your mineralogical experiences


Spanish message board






Newest topics and users posts
31 Oct-12:39:30 Re: collection of michael shaw (Michael Shaw)
31 Oct-05:34:05 Re: munich show (mineralientage) 2024 (James Catmur)
30 Oct-14:07:27 Re: introduction with some pictures (Philippe Durand)
30 Oct-11:47:09 Re: contribution dr. Menor-salván - bertrandite from portuguese pegmatites - (51) (Fmf Forum)
30 Oct-11:46:20 Contribution dr. Menor-salván - bertrandite from portuguese pegmatites - (51) (Fmf Forum)
30 Oct-09:41:36 Re: munich show (mineralientage) 2024 (James Catmur)
30 Oct-09:36:03 Re: introduction with some pictures (James Catmur)
30 Oct-08:50:48 Re: introduction with some pictures (Michael Shaw)
30 Oct-05:58:51 Introduction with some pictures (Pegmatiteappreciator)
29 Oct-23:45:34 My 44th visit to the mineralientage in munich since 1977 (Roger Warin)
29 Oct-09:20:39 Collection of carles millan: fluorite from erongo (Carles Millan)
29 Oct-03:57:49 Re: is this a gold ore??? (Vdhinesh79)
29 Oct-00:04:37 Re: collection of volkmar stingl (Volkmar Stingl)
28 Oct-12:12:31 Re: is this a gold ore??? (Vdhinesh79)
28 Oct-12:10:40 Re: is this a gold ore??? (Jordi Fabre)
28 Oct-12:07:43 Re: is this a gold ore??? (Matt_zukowski)
28 Oct-11:55:16 Re: is this a gold ore??? (Lluis)
28 Oct-10:22:03 Re: is this a gold ore??? (Vdhinesh79)
28 Oct-06:27:20 Re: is this a gold ore??? (James Catmur)
28 Oct-06:01:21 Re: is this a gold ore??? (Vdhinesh79)
28 Oct-04:28:43 Re: the mim museum in beirut, lebanon (Mim Museum)
28 Oct-03:29:52 Re: is this a gold ore??? (Vdhinesh79)
28 Oct-02:35:31 Re: is this a gold ore??? (Alfredo)
27 Oct-17:09:16 What might this be? (Todd Willis)
27 Oct-16:38:02 Re: sphalerite from kulmberg austria (Jordi Fabre)

For lists of newest topics and postings click here


RSS RSS

View unanswered posts

Why and how to register

Index Index
 FAQFAQ RegisterRegister  Log inLog in
 {Forgotten your password?}Forgotten your password?  

Like
115978


The time now is Oct 31, 2024 17:58

Search for a textSearch for a text   

A general guide for using the Forum with some rules and tips
The information provided within this Forum about localities is only given to allow reference to them. Any visit to any of the localities requires you to obtain full permission and relevant information prior to your visit. FMF is strictly against any illicit activities related to collecting minerals.
Jadeite question
  
  Index -> Minerals and Mineralogy
Like


View previous topic :: View next topic  
Author Message

preciousgem




Joined: 15 Aug 2009
Posts: 1
Location: Somers

View user's profile

Send private message

PostPosted: Aug 15, 2009 10:52    Post subject: Jadeite question  

Is it possible to determine by visual examination aided by magnifying glass if a gem stone carving in shape of an art object is made of jadeite or quartzite, especially if color enhanced, or it needs gemological lab identification?
I read that quartzite gem stones have a composition of different minerals, chemical components and would like to know how the lab ID might be influenced by the multitude of components and how the lab will identify each component separately, or determination is based on the mineral or chemical component that represents the majority percentage in quartzite.
Thank you in advance,
Michael
Back to top
Reply to topic Reply with quote
Like
   

keldjarn




Joined: 18 Feb 2008
Posts: 157


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Aug 15, 2009 13:22    Post subject: Re: Jadeite question  

I think it may be difficult to determine for sure just by a visual examination if a carving is made of jadeite or quartzite, but jadeite has a hardness of 6 and Quartz 7. Thus with a small quartz crystal it should me possible to scratch jadeite - but it would be more difficult with quartzite ( still being a rock rather than a pure mineral, quartzite may contain small flakes of mica etc which can give the impression of a reduced hardness. )
Back to top
Reply to topic Reply with quote
Like
   

John S. White
Site Admin



Joined: 04 Sep 2006
Posts: 1297
Location: Stewartstown, Pennsylvania, USA


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Aug 16, 2009 05:16    Post subject: Re: Jadeite question  

I agree that it can be quite difficult to make an absolute determination using simple tests. If the object is dyed quartzite then you might try to dissolve some of the dye using various relatively common solvents. Apply the solvent to a small area, let it sit for a few minutes, then dab it up with a paper towel to see if any color comes off. Of course your object could be dyed jadeite in which case this test doesn't really help in identifying what it is, just that it has or has not been dyed.
_________________
John S. White
aka Rondinaire
Back to top
Reply to topic Reply with quote
Like
   

lluis




Joined: 17 Nov 2006
Posts: 715

View user's profile

Send private message

PostPosted: Aug 16, 2009 09:47    Post subject: Re: Jadeite question  

Good afternoon

Talking from what I remember of when I was working by a gem dealer (when young,; say, when still tyhe dinosaurs were in earth...), jadeite is very difficult to polish completely homogeneously. It usually have at least tiny spots of greasy aspect among the shiny mass.
Quartzite polish evenly.

So, in principle, if any greasy spot, it is jadeite. If not, could be both still.... (but more probably quatrzite)

With best wishes

Lluís
Back to top
Reply to topic Reply with quote
Like
   
Display posts from previous:   
   Index -> Minerals and Mineralogy   All times are GMT - 5 Hours
Page 1 of 1
    

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum


All pictures, text, design © Forum FMF 2006-2024


Powered by FMF