[Rockhounds] Need Quick Help

[Stephen Shimatzki]

John,
Too bad no pictures to help with the discription.   Remember, if it is in a
touristy area, uts probably overpriced.  Lol



On Oct 23, 2017 11:42 AM, <larryrush at att.net> wrote:

John: If the color is a bright blue, I would be suspicious. The Chinese
make chalcanthite  (soluble CuSO4) these days. And it can form as small,
flat crystals in crusts. Since copper is not common in SE Asia, It is
possible that what you have is man-made. It is probably not related to any
cobalt mineral, in any way.

Larry Rush

======================================================

-----Original Message-----
From: Rockhounds [mailto:rockhounds-bounces at rockhounds.drizzle.com] On
Behalf Of John Scully
Sent: Monday, October 23, 2017 4:12 AM
To: Rockhounds <rockhounds at rockhounds.drizzle.com>; Virgil Lueth <
vwlueth at nmt.edu>
Subject: [Rockhounds] Need Quick Help

Hello, All

I am in Yen The, Vietnam for two more days.  The shops are selling a new
mineral they call coban or co ban.  It is small bright blue crystals
crusted on an indeterminate matrix.  Under a loupe the crystals are
formless.  It is very pricey.  I cannot find anything out about it on
Google except that it means "cobalt" in Vietnamese.  Help!  If it really is
something desirable beyond its nice appearance, I would buy a few pieces.

Thanks
John Scully
☺
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