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Unknown rock ?

Posted by Heath Barnes  
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Heath Barnes
Unknown rock ?
June 21, 2012 08:59PM
Any ideas what this is?
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Attachments:
open | download - DSCF1253-001.JPG (97.6 KB)
Don Saathoff
Re: Unknown rock ?
June 21, 2012 09:41PM 		us    
Could be a chlorite group mineral, could be a serpentine group mineral, could be an amphibole group mineral - need a LOT more data!!! Hardnes, streak, density, etc. Read the "How To" flagged at the top of this forum.......(by the late Alan Plante).

Don S.
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Heath Barnes
Re: Unknown rock ?
June 22, 2012 10:13PM
Just realised what it is mate its a 2 to 500 million year old sponge, ( limestone )
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Karl Volkman
Re: Unknown rock ?
August 02, 2012 11:02PM 		us    
2-500 million? that time frame is very very large. What makes you suggest it?
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Heath Barnes
Re: Unknown rock ?
August 04, 2012 06:23PM
Sorry Karl i will check the sponge and fossils like it are abundant in the stainton gravel beds, but to be honest they don't really do it for me! but ime sure ive seen while looking them up that this type of sponge was around for that type of time scale.
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Karl Volkman
Re: Unknown rock ?
August 05, 2012 01:20AM 		us    
Sponges as a Phylum of animals have, however the families in the phylum have not, and individual species are certainly not.
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Heath Barnes
Re: Unknown rock ?
August 06, 2012 10:36PM
As i told ya mate they don't do it for me so yave just lost me! i just dig em out of the newly descovered Stainton gravel beds.
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Karl Volkman
Re: Unknown rock ?
August 06, 2012 11:29PM 		us    
So where did the age description come from?
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Karl Volkman
Re: Unknown rock ?
August 07, 2012 02:29AM 		us    
Actually heath, Given the small nature of the attached image, I cant even tell if it is in fact a sponge. Who made the identification, and what were the characters present that where used in this determination?
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Jim Bean
Re: Unknown rock ?
August 07, 2012 02:33AM 		us    
Gravel beds are an unlikely geologic environment to find sponge fossils, unless they have been reworked which is unusual. Better and more varied pictures might help.
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Heath Barnes
Re: Unknown rock ?
August 07, 2012 10:58PM
Thanks for the interest ile try post better pics tomoz but heres a wierd one i found while me and Roger were up in teesdale, any ideas?
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Attachments:
open | download - DSCF2087-001.JPG (94.3 KB)
open | download - DSCF2090-001.JPG (77.9 KB)
open | download - DSCF2091-001.JPG (86.1 KB)
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Stephanie Martin
Re: Unknown rock ?
August 08, 2012 01:50AM 		ca    
Heath,

These are very reminiscent of "melicaria" from Mexico. They are the calcite interiors of sedimentary nodules where the interiors remained after the other parts were solved away. Some of these are labelled as quartz although I believe some testing has been done and were found to be carbonate, probably calcite.

compare:

[www.mindat.org]

regards,
stephanie smiling smiley
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Heath Barnes
Re: Unknown rock ?
August 08, 2012 08:34PM
Thanks Stephenie yes it looks very simmiler ive tested it with viniger and there is noreaction at all both with the viens? and hard clay ps and ime sorry to have to keep bringing this up but the hard clay is attracted to a magnet ie it will pull a rare earth magnet and a lesser streanghth magnet.



Edited 1 time(s). Last edit at 08/08/2012 08:39PM by Heath Barnes.
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Stephanie Martin
Re: Unknown rock ?
August 08, 2012 09:38PM 		ca    
Heath, since there was no reaction to the vinegar they could be quartz then. Either way I think they are the interior remains of nodules and look cool.

Good luck with your excavations and blogs.

regards,
stephanie smiling smiley
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Heath Barnes
Re: Unknown rock ?
August 08, 2012 09:50PM
On the same unknown subject how about this ive had it along time now and still don't know what the shell is or the rock its in? again i am sorry as it seems to offend some! but this fossil atracts a rare earth magnet although it does not atract my less powerfull magnets
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Attachments:
open | download - DSCF2237-001.JPG (86.5 KB)
open | download - DSCF2239.JPG (86.2 KB)
Heath Barnes
Re: Unknown rock ?
August 08, 2012 09:57PM
Cheers Stephenie wierd stuff eh? this is what keeps us all at it eh!
ps this a pic ofthe magnetic attractionof the clay.
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Attachments:
open | download - DSCF2234.JPG (79.3 KB)
Heath Barnes
Re: Unknown rock ?
August 08, 2012 10:38PM
Some finds in nodules from another location we visited we found there contents most interesting!
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Attachments:
open | download - DSCF2241-001.JPG (123.2 KB)
open | download - DSCF2243-001.JPG (112.6 KB)
open | download - DSCF2245-001.JPG (119.8 KB)
Yanick Beaudet
Re: Unknown rock ?
August 08, 2012 10:40PM
for your second serie of pictures.a quartz pseudomorphing after a blade like mineral ? look a bit like my own specimens of quartz after wulfenite. bye



Edited 1 time(s). Last edit at 08/09/2012 05:23AM by Yanick Beaudet.
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Heath Barnes
Re: Unknown rock ?
August 08, 2012 10:44PM
Couldyoushow me an image?
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Yanick Beaudet
Re: Unknown rock ?
August 09, 2012 05:20AM
hi, the last pictures you post are septarian nodules for sure.bye
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