Hi all
Quite liked this photo so I thought I would share it...
Its hemispherical siderite (an iron carbonate mineral) that has been coated with a clay mineral (probably montmorillonite) which has dehydrated and cracked, and then another generation of siderite has been deposited and formed preferentially on the cracks, giving the "basket weave" look. Field of view is about 5mm.
Basket Weave Siderite...
Moderators: rjlittlefield, ChrisR, Chris S., Pau
Basket Weave Siderite...
Last edited by crocoite on Sat Feb 17, 2007 6:51 pm, edited 1 time in total.
- Bruce Williams
- Posts: 1120
- Joined: Mon Oct 30, 2006 1:41 pm
- Location: Northamptonshire, England
- Contact:
I can see why you liked this photo Steve. Extraordinary shapes - quite bizarre and other-worldly!
An interesting (albeit trivial) optical effect: When I first looked at the image I assumed the lines of siderite to be below the level of the cream coloured clay mineral (particularly on largest spherical shape). However, if I'm reading you correctly the siderite has been deposited on the cracks above the level of the clay.
Bruce
An interesting (albeit trivial) optical effect: When I first looked at the image I assumed the lines of siderite to be below the level of the cream coloured clay mineral (particularly on largest spherical shape). However, if I'm reading you correctly the siderite has been deposited on the cracks above the level of the clay.
Bruce
Very interesting Steve. nice textures and patterns. When I first opened the post, I thought it was a lichen or something organic (I know nobody else looks at the pictures first ). To me it looks like the siderite did not fill the cracks totally.
Take Nothing but Pictures--Leave Nothing but Footprints.
Doug Breda
Doug Breda
- Mike B in OKlahoma
- Posts: 1048
- Joined: Fri Aug 04, 2006 10:32 pm
- Location: Oklahoma City
Very interesting! There's a lot of DOF to cover here, tough shot but interesting subject.
Mike Broderick
Oklahoma City, OK, USA
Constructive critiques of my pictures, and reposts in this forum for purposes of critique are welcome
"I must obey the inscrutable exhortations of my soul....My mandate includes weird bugs."
--Calvin
Oklahoma City, OK, USA
Constructive critiques of my pictures, and reposts in this forum for purposes of critique are welcome
"I must obey the inscrutable exhortations of my soul....My mandate includes weird bugs."
--Calvin
Thanks Bruce. and you are quite correct. I'll post a photo of another specimen later tonight that shows it much more graphically.Bruce Williams wrote:I can see why you liked this photo Steve. Extraordinary shapes - quite bizarre and other-worldly!
An interesting (albeit trivial) optical effect: When I first looked at the image I assumed the lines of siderite to be below the level of the cream coloured clay mineral (particularly on largest spherical shape). However, if I'm reading you correctly the siderite has been deposited on the cracks above the level of the clay.
Bruce
Good capture there man, 5 mm?? Wow!!
The cracks remind me of those fossilized dinosaur eggs you sometimes see from the mongolian desert. I think they where protoceratops' but I'm not sure.
Keep 'em coming!!!
All the best,
Tom B
The cracks remind me of those fossilized dinosaur eggs you sometimes see from the mongolian desert. I think they where protoceratops' but I'm not sure.
Keep 'em coming!!!
All the best,
Tom B
Sometimes smaller is better eh? nodge nodge :lol
Canon EOS 450D
Sigma MACRO 70mm F2.8 EX DG
Tamron AF70-300mm F/4-5.6 Di LD Macro
No external flash yet
Canon EOS 450D
Sigma MACRO 70mm F2.8 EX DG
Tamron AF70-300mm F/4-5.6 Di LD Macro
No external flash yet