PrehistoricFlorida Posted May 31, 2008 Share Posted May 31, 2008 here's some pretty rocks we picked up last week... www.PrehistoricFlorida.com Link to comment Share on other sites More sharing options...
JohnJ Posted May 31, 2008 Share Posted May 31, 2008 Auriculatus, I find similar (smaller) pieces here in Texas. The first 5 pics may fall under the broad umbrella of chalcedony. I always pocket the "gemmy" looking pieces! I'm not sure about the yellow ones, but they're all nice! The human mind has the ability to believe anything is true. - JJ Link to comment Share on other sites More sharing options...
Guest solius symbiosus Posted May 31, 2008 Share Posted May 31, 2008 ^They are all boytroidal quartz. I find it sometimes with secondary growths of cubes in geodes around here. Link to comment Share on other sites More sharing options...
PrehistoricFlorida Posted May 31, 2008 Author Share Posted May 31, 2008 no, actually they're coral. well documented with clearly visible polyps on outside. www.PrehistoricFlorida.com Link to comment Share on other sites More sharing options...
Guest solius symbiosus Posted May 31, 2008 Share Posted May 31, 2008 I don't doubt that it is coral, but those bulbous masses are a type of mineralization known as botryoidal. http://www.encyclo.co.uk/define/Botryoidal Link to comment Share on other sites More sharing options...
Bill Posted May 31, 2008 Share Posted May 31, 2008 I agree, coral may be present, but it is a botryoidal form of Quartz called Chalcedony. Here is a not very good pic' of my blue Chalcedony lining the inside of a flint pebble. http://www.mindat.org/photo-2932.html KOF, Bill. Welcome to the forum, all new members www.ukfossils check it out. Link to comment Share on other sites More sharing options...
Guest solius symbiosus Posted May 31, 2008 Share Posted May 31, 2008 ^Nice pic! I'll dig some stuff out of the wharehouse, sometime, soon. Link to comment Share on other sites More sharing options...
Harry Pristis Posted May 31, 2008 Share Posted May 31, 2008 Auriculatus is showing us fragments of geodized agatized coral. These geodes occur in Florida in the Tampa Formation (ca. 25 Ma) in the Tampa Bay area and in North Florida. The quartz lining of the geodes may be botryoidal in form or it may be drusy (tiny crystals) in form. Agatized coral is the official Florida state gemstone. Read more here: http://www.thefossilforum.com/index.php?autocom=gallery&req=si&img=474 http://pristis.wix.com/the-demijohn-page What seest thou else In the dark backward and abysm of time? ---Shakespeare, The Tempest Link to comment Share on other sites More sharing options...
Bill Posted May 31, 2008 Share Posted May 31, 2008 Agate is a variety of Chalcedony, which in turn, is a cryptocrystalline variety of Quartz. Edit, Harry, nobody has doubted the presence of Coral, simply stated that the mineral is Chalcedony in fact your link also states Chalcedony. KOF, Bill. Welcome to the forum, all new members www.ukfossils check it out. Link to comment Share on other sites More sharing options...
Harry Pristis Posted June 1, 2008 Share Posted June 1, 2008 Agate is a variety of Chalcedony, which in turn, is a cryptocrystalline variety of Quartz.Edit, Harry, nobody has doubted the presence of Coral, simply stated that the mineral is Chalcedony in fact your link also states Chalcedony. I'm not disagreeing with anything particular in this thread, Bill; I was just trying to flesh out the details for Auriculatus' Florida finds. As you say, my narrative accompanying the image gives the mineral details. I try to avoid arguments with myself 'cause I always lose! LOL http://pristis.wix.com/the-demijohn-page What seest thou else In the dark backward and abysm of time? ---Shakespeare, The Tempest Link to comment Share on other sites More sharing options...
Bill Posted June 1, 2008 Share Posted June 1, 2008 My apologies Harry. I thought you meant that, I/we, were saying "not coral" and that you were disagreeing with "chalcedony". KOF, Bill. Welcome to the forum, all new members www.ukfossils check it out. Link to comment Share on other sites More sharing options...
Maryland Mike Posted June 1, 2008 Share Posted June 1, 2008 Really nice! Those would look great in a glass-topped backlit coffee table display, wouldn't they? Carpe Diem, Carpe Somnium Link to comment Share on other sites More sharing options...
PrehistoricFlorida Posted June 1, 2008 Author Share Posted June 1, 2008 Really nice! Those would look great in a glass-topped backlit coffee table display, wouldn't they? Yes they would, and they can be yours....... http://search.ebay.com/_W0QQsassZcurtyarti...1QQfsooZ1QQrdZ0 www.PrehistoricFlorida.com Link to comment Share on other sites More sharing options...
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