[Rockhounds] Blue green apophyllite

[Axel Emmermann]

Vanadium is known to color some minerals in some shades of blue...
On the other hand: so are iron and titanium. 
http://www.minsocam.org/MSA/collectors_corner/arc/apophyllite.htm

Cheers
Axel


> -----Oorspronkelijk bericht-----
> Van: rockhounds-bounces at lists.drizzle.com 
> [mailto:rockhounds-bounces at lists.drizzle.com] Namens Lawrence Rush
> Verzonden: zondag 21 oktober 2007 14:44
> Aan: Rock Currier; Rockhounds at drizzle.com: A mailing list for 
> rock and gem collectors
> Onderwerp: Re: [Rockhounds] Blue green apophyllite
> 
> Thanks, Rock..... You are right, the hardness of the matrix 
> is around 6-7, and it is insoluble in HCl. This material is 
> concretionary in appearance, and is not erosional. It is 
> possibly quartz. There are distinct perfect hemispheres of a 
> softer,white material (Stilbite?) on a few of the Apophyllite 
> crystals. As an additional note, there is a green, radiating 
> mineral, which shows in the center of the 
> stalactites/stalagmites. This is dark green, fibrous, and 
> relatively soft.
> 
> I have asked the supplier what quarry these came from, but, 
> as you know, it is not always easy to get specifics from the 
> people who pass these specimens on.
> 
> Thanks again......Larry
> 
> 
> 
> 
> ----- Original Message -----
> From: "Rock Currier" <rockcurrier at cs.com>
> To: <rockhounds at lists.drizzle.com>
> Sent: Sunday, October 21, 2007 3:16 AM
> Subject: [Rockhounds] Blue green apophyllite
> 
> 
> > Lary,
> >
> > It is very unlikely that the apophyllite crystals are growing on 
> > natrolite. When I first went to India they called anything 
> thin, white and 
> > prismatic natrolite. None of the many, many specimens of 
> white prismatic 
> > minerals I encountered ever turned out to be natrolite. 
> Also none of the 
> > mamillary or stalactitic material was ever identified as 
> natrolite either. 
> > To the best of my knowledge there has never been a 
> confirmed find of 
> > natrolite in India except in one specimen and the natrolite 
> was confirmed 
> > optically to be located in the center of a small prismatic mesolite 
> > crystal from the quarry the runners called Malad to the 
> north of Bombay. 
> > You might want to ask you supplier who did the analysis of 
> the specimens 
> > and then contact them to determine what tests they ran. 
> Also the locality 
> > for the apophyllite is not likely to be Jalgaon. Jalgaon is 
> a sizeable 
> > city and most of the specimens attributed to that city 
> actually come from 
> > quarries some miles to the west of there near a village 
> called Paldi.
> >
> > Rock
> >
> >
> >
> > I recently got a dozen pieces of an unusual blue-green variety of
> > Apophyllite. Although these are from Jalgoan, India, they 
> do not look at 
> > all
> > like the usual blocky form of Apophyllite from there. These 
> are different 
> > in
> > color, and are arranged in a parallel habit, with the prism being 
> > elongated
> > and frequently twinned. Apparently they never occur as 
> single crystals.The
> > matrix (Natrolite) is mamillary and stalagmatitic.
> >
> >
> >
> >
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