[MSA-talk] wire iron
dicksonfwgranite at gmail.com
Tue Dec 5 10:20:31 EST 2017
*4Dec17 Hello Alfredo and MSA Talk. A thing wonderful about geology
mineralogy natural science is nature chooses her paths, lately by Adrian
Bejan and Bill Tiller concepts. We have fun figuring out why wire grows,
as Alfredo asks. In Papoose Flat pluton and host rocks occur m**etastable
orthoclase crystals, not sanidine or microcline, and beta quartz.** Nature
chose a K-feldspar uncannily the same color, textures, structures, size.
and internal boxy oriented inclusions in my 2000 reaction cell. Papoose
Flat Type **intrusive** are world wide. Best regards, Frank Dickson *
On Tue, Dec 5, 2017 at 12:01 AM, Alfredo Petrov <alfredo at mindat.org> wrote:
> The native silver wires seem to grow by having material added to the
> bottom, the base, ie. material "pushed" out from the decomposing matrix
> under it. So the terminal end of the wire would be the oldest deposit and
> the base the youngest. You can observe this happening in a few minutes by
> heating acanthite with the flame of a blowtorch.
> Native iron, on the other hand, being magmatic, created by reduction in a
> melt, would be unlikely to grow in such habit.
> On 5 December 2017 at 07:52, Magloughlin,Jerry <
> Jerry.Magloughlin at colostate.edu> wrote:
>> Two related questions: Is anyone aware of papers describing native iron
>> in a wire habit, akin to
>> what is sometimes present in native silver and native gold? I have a lot
>> of papers on native iron
>> and nearly all seem to illustrate or describe a generally granular or
>> blocky or irregular habit.
>> Second, why does a ‘wire’ habit develop in these isometric minerals? Any
>> papers describing this
>> would be much appreciated.
>> Jerry F. Magloughlin
>> Colorado State University
>> MSA-talk mailing list
>> MSA-talk at minlists.org
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