[Rockhounds] Unknown mineral

[R. Peter Richards]

Larry, if it's malachite it will also dissolve in acid with  
effervescence.

Pete


On Aug 12, 2008, at 3:59 PM, Lawrence Rush wrote:

> 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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___________________________________
R. Peter Richards
rpr at heidelberg.edu
Morphological crystallographer





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