[Rockhounds] Unknown mineral

[Lawrence Rush]

OK...good reaction with Phosphoric acid, and the crystal structure looks 
like Calcite. The inclusions are a pretty bright green for Conichalcite or 
Aurichalcite, no single fibers,or sprays, and they are all single spheres, 
suggesting Malachite. The paragenesis is interesting, since neither mineral 
appears alone, and every Calcite crystal has a spherule in the center. In 
addition to the green crystallization, there are tiny brown nodules in the 
crystal interiors. A couple of the Calcite crystals have windows, or holes 
leading into the interior to expose the inclusions. Maybe a secondary 
dissolution?

I am going to call it Calcite with Malachite inclusions, from Mapimi, for 
now. (there were some pieces of Mapimi labels where the mice didn't chew all 
of them!!)

THANKS very much to you, Pete, Earl, and Jim...exactly what I was looking 
for!

Larry

=============================
----- Original Message ----- 
From: "Jim Daly" <sauktown1 at yahoo.com>
To: "Rockhounds at drizzle.com: A mailing list for rock and gem collectors" 
<rockhounds at lists.drizzle.com>
Sent: Tuesday, August 12, 2008 3:15 PM
Subject: RE: [Rockhounds] Unknown mineral


>I agree with Earl- looks like it could be from Mapimi, and it's an 
>inclusion, most likely in calcite- acid would tell. The color, though, 
>suggests malachite rather than aurichalcite.
> Jim
>
> --- On Tue, 8/12/08, Earl R. Verbeek <everbeek at ptd.net> wrote:
>
> From: Earl R. Verbeek <everbeek at ptd.net>
> Subject: RE: [Rockhounds] Unknown mineral
> To: "'Rockhounds at drizzle.com: A mailing list for rock and gem collectors'" 
> <rockhounds at lists.drizzle.com>
> Date: Tuesday, August 12, 2008, 11:58 AM
>
> As I so often said during the 60s, I think you should drop some acid.
> That'll confirm or rule out calcite.  Perhaps is aurichalcite included
> in calcite or aragonite?  I've seen aurichalcite intergrown with
> hemimorphite (another possibility) from Mapimi.
>
>             Cheers-    Earl
>
> ----------------------------------------------------
> Dr. Earl R. Verbeek
> Resident Geologist
> Sterling Hill Mining Museum
> P:  973-209-7212
> F:  973-209-8505
> E:  shmm at ptd.net
>
>
> -----Original Message-----
> From: rockhounds-bounces at lists.drizzle.com
> [mailto:rockhounds-bounces at lists.drizzle.com] On Behalf Of Lawrence Rush
> Sent: Tuesday, August 12, 2008 2:49 PM
> To: Rockhounds at drizzle.com: A mailing list for rock and gem collectors
> Subject: [Rockhounds] Unknown mineral
>
> I need some help with an unknown. It can be seen at:
>
> http://www.connroxminerals.com/bone.html
>
> This is one of the specimens I recently got where the boxes and labels
> had
> been destroyed...
>
> Any ideas?
>
> Larry
>
>
>
>
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