There was quite a discussion about this on the "Rock Tumbling Hobby" site, as someone had posted a find of black jade from Arizona. Well, I have found what could be termed black jade in Arkansas but a dealer told me it is jet. The consensus on the hobby site seemed to me that the material is something other than jade.
The fellow who found it had a web site but it has disappeared. He said in posts on the hobby site that he was having the material tested. I found nothing further about it.
In the discussion queue there is a quote from John Sinkakas: "At this time (1997) I can find no confirmation of either jadeite or nephrite in Arizona."
I would tend to take that as gospel, Sinkakas is the man when it comes to gemstones. Above is a photo posted on the site of material from the "black jade" discovery. The entire discussion may be found here (link).
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