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

[betdav97 at aol.com]

Don't forget to look for flects of gold in the Potomic marble.
If you come to the Gaithersburg show next month, I have
lots of fluorescent specimens,
dave


-----Original Message-----
From: Jeffrey T. Cessna <jcessna at nist.gov>
To: Rockhounds at drizzle.com: A mailing list for rock and gem collectors 
<rockhounds at lists.drizzle.com>
Sent: Fri, 6 Feb 2009 11:01 am
Subject: Re: [Rockhounds] Winter Blah's Pop Quiz - What Was The Last 
Specimen Added To Your Collection?


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 piece20with 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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