[Rockhounds] Scapolite

[Axel Emmermann]

Hi Kreigh,

 

Thanks for the search but I'm afraid that the text you found only states
that:

" The other members of the group, meionite, mizzonite and marialite, are
much rarer in occurrence. Their crystals are usually smaller and of better
quality than those of wernerite. Meionite and missonite (misspelled
mizzonite?) are found in limestone blocks on Monte Somma." 

 

That's throwing in all the scapolite group ;-))) Mizzonite and wernerite are
not recognized by the IMA.

Mizzonite is still sometimes used to indicate a scapolite with composition
closer to that of marialite. The article describes wernerite as somewhere in
the mid-section between marialite and meionite but somewhat closer to the
meionite-end.

My question came up after reading:
http://www.minsocam.org/ammin/AM51/AM51_1014.pdf

It's on page 9, last paragraph.

It's much more complex than I like my reading but it got me thinking.
conflicting symmetries that disturb electron densities could lead to
disturbed growth, could it not?

 

Cheers

Axel

 

 

> -----Oorspronkelijk bericht-----

> Van: rockhounds-bounces at lists.drizzle.com
[mailto:rockhounds-bounces at lists.drizzle.com]

> Namens Kreigh Tomaszewski

> Verzonden: maandag 22 september 2008 2:59

> Aan: Rockhounds at drizzle.com: A mailing list for rock and gem collectors

> Onderwerp: Re: [Rockhounds] Scapolite

> 

> Meionite is less likely to be found as large crystals. See

> http://www.miningbasics.com/html/scapolite_group_-_wernerite_co.php

> from my "I'm Feeling Lucky" Google search.

> 

> Kreigh

> 

> 

> 

> 

> 

> On Sunday, Sep 21, 2008, at 18:11 America/Detroit, Axel Emmermann wrote:

> 

> > Hi list,

> >

> >

> >

> > I'm doing some pondering on scapolite.

> >

> > Does anybody know whether the Ca and CO3-rich end-member, meionite, is

> > less

> > likely to be found well formed, large crystals than the Na and Cl

> > end-member

> > marialite?

> >

> > It should have something to do with crystal-chemical hindering by the

> > carbonate group sticking through one of the boundary planes of the unit

> > cell.

> >

> >

> >

> > Anybody who knows?

> >

> >

> >

> > Cheers

> >

> >

> >

> > Axel

> >

> >

> >

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> 

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