[Rockhounds] Winter Blah's Pop Quiz - What Was The Last Specimen Added To Your Collection?

[Nathan Martin]

Jeff,
Thanks for the links regarding the Leesburg formation.  I really enjoyed
them.
Nate Martin

On Fri, Feb 6, 2009 at 11:01 AM, Jeffrey T. Cessna <jcessna at nist.gov> wrote:

> At 10:29 PM 2/5/2009, you wrote:
>
>        What Was The Last Specimen Added To Your Collection?
>>
>
> Purchased:
>
> Willemite Zn2(SiO4) fl green SW/LW
> Sphalerite (Zn,Fe)S  fl,ph yellow ?W
> Calcite-(Mn) CaCO3 fl red SW
> Hasselhojden, Grythyttan, Sweden
> Size: 6.5x4x4 cm (144g)
>
> It is still in the mail, from sweden, but I have really enjoyed the other
> fluorescents I have purchased from Kjell Gatedal (unsolicited endorsement)
> on eBay.
>
> Collected (31 jan 09):
>
> Potomac Marble (limestone conglomerate)
> Leesburg Member, Balls Bluff Siltstone
> Rt 15 N of Leesburg, Loudoun Co., Virginia
>
> I collected several pieces, chosen for either interesting constituents or
> interesting patterns. I put down the piece with the intact 6 cm feldspar
> crystal and couldn't find it again. Often the stones making up the
> conglomerate are themselves pieces of weathered conglomerate. I found a 30 x
> 10 x 2.5 cm piece with half of one face covered with small milky quartz
> crystals from a later vein filling. If you can bring yourself to cut it, it
> will take a very nice polish. I have included a few links with more
> information.
>
> http://www.mcmullans.org/geoweb/BasicPageListing/leesburg_member.htm
>
> http://pubs.usgs.gov/gip/stones/stones3.html
>
> pictures
> http://www.nvcc.edu/home/cbentley/geoblog/2008/05/western-conglomerates-culpeper-basin.html
>
>
> Cheers,
> Jeff
>
>


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