[Rockhounds] mystery mineral

[Axel Emmermann]

Pete,

I'm far from good (but good from afar) in dissecting twins and triplets but
isn't that what this is?
I think is see triangular indentations just above 0.75 inch and 1 inch
marks, just below the conchoidal dent on the "square face".  You can make a
square with two and four triangles.
How would you call that... penetration twins or quadruplets or something
like that?
Am I making sense?

Cheers
Axel

> -----Oorspronkelijk bericht-----
> Van: rockhounds-bounces at lists.drizzle.com
[mailto:rockhounds-bounces at lists.drizzle.com]
> Namens Pmodreski at aol.com
> Verzonden: donderdag 26 maart 2009 22:18
> Aan: rockhounds at lists.drizzle.com
> Onderwerp: Re: [Rockhounds] mystery mineral
> 
> Hey, I'll agree, it does look just like a plain old dirty, water-worn
piece
> of quartz.
> But it's just that there's nothing "hexagonal" at all about the crystal,
the
> faces are all at what appear to be 90 or 45 degree angles.  I've seen
those
> pseudocubic quartz xls too, but nothing that looked like this. It's just
> buggin' me, that it's so ambiguous whether this is a natural crystal, or
> something shaped artificially...
> 
> Pete
> 
> 
> In a message dated 3/26/2009 2:47:37 P.M. Mountain Daylight Time,
> buff1 at ptd.net writes:
> 
> Pmodreski at aol.com wrote:
> > I've posted a photo of my "rectangular  quartz crystal" to the Ning -
> > Rockhounds at Drizzle  website.  You can see the squarish flat
termination
> on the
> >  left, the flat "prism" faces, the many dings and chips (showing
> conchoidal
> > fracture), and on the lower left is the smaller triangular  face which
> resembles
> > what would be a (111) face in an  orthorhombic crystal.
> >
> >
> OK, I'll suffer  the flames and arrows, but it sure looks like plain old
> quartz to me. For  me that is about the quality of specimen I would hope
> to find  anymore.
> The text book perfect crystals are for the museum curators and  those
> with well lined wallets.
> The picture shows what appears to be a  worn crystal that was subjected
> to much abrasion being circulated in  gravel or associated broken matrix.
> The crystal faces appear to be odd  angled interpentration twins that do
> not subject themselves to any  particular quartz law. i.e. faden, japan
> law, pseudo hexagonal, or any  other easily described habit.
> Again, I said the picture looks  like.....
> 
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