djsparkles
noticing nice landscape pebbles
Member since June 2010
Posts: 79
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Post by djsparkles on Apr 22, 2012 19:15:39 GMT -5
Oaky I know I saw something on here about this type of stone, but I can't for the life of me find it again. Can someone help me out?
I gather a lot of stone near our railroad tracks (about half a block from our house) and was wondering if any of what I got tonight was known as banded iron. I remember seeing some pics of both raw and polished and can't seem to find the post again, even with searching.
Pics later if I can make my camera work, to see if someone can identify them...
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Post by geoff on Apr 22, 2012 19:39:42 GMT -5
BIF!
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shermlock
has rocks in the head
Member since August 2011
Posts: 612
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Post by shermlock on Apr 22, 2012 19:53:33 GMT -5
Was it called hematite? Scott
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djsparkles
noticing nice landscape pebbles
Member since June 2010
Posts: 79
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Post by djsparkles on Apr 22, 2012 20:05:00 GMT -5
Shoot, what I have isn't anywhere near as nice as that... those are gorgeous! Pics coming along, maybe it's just rust stains on the rock
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snuffy
Cave Dweller
Member since May 2009
Posts: 4,319
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Post by snuffy on Apr 22, 2012 20:05:55 GMT -5
It was probably the thread from morsefire about the BIF he found and showed pictures.A couple weeks ago.
snuffy
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snuffy
Cave Dweller
Member since May 2009
Posts: 4,319
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Post by snuffy on Apr 22, 2012 20:14:23 GMT -5
Ooooooh man,score!! by morsefire, near top of page 2, General Rocks Board.
snuffy
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Post by Hard Rock Cafe on Apr 22, 2012 20:53:15 GMT -5
Where do you live, dj? Rock is not usually hauled very far, so that would help with the ID when you get pictures.
Chuck
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djsparkles
noticing nice landscape pebbles
Member since June 2010
Posts: 79
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Post by djsparkles on Apr 22, 2012 20:57:19 GMT -5
Okay, so I was really wrong about the BIF I think, dang it. If anyone could help me ID these, though, I'd be forever grateful. I figure they're all pretty common stones, but hey, they look good and I can't wait to see how they tumble! i6.photobucket.com/albums/y223/DJSparkles/SAM_0165-1.jpgi6.photobucket.com/albums/y223/DJSparkles/SAM_0166.jpgi6.photobucket.com/albums/y223/DJSparkles/SAM_0167.jpgi6.photobucket.com/albums/y223/DJSparkles/SAM_0168.jpgThe last one is really odd, it almost appears like a piece of asphalt, but it isn't. Too hard, and not quite right, if that makes any sense...
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Minnesota Daniel
freely admits to licking rocks
A COUPLE LAKERS
Member since August 2011
Posts: 891
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Post by Minnesota Daniel on Apr 22, 2012 23:00:40 GMT -5
The first I can't tell, but it looks like it might polish. The second and third I believe are gneiss/granite, and the fourth looks like porphyry, either basalt or rhyolite.
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Deleted
Deleted Member
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Post by Deleted on Apr 22, 2012 23:57:26 GMT -5
dj, is it attracted to a magnet? The silver looks like the magnetite that I find around here. If it is it polishes great. Not sure about the other though. What I find here has bands that appear to be some kind of jasper, red and yellow but brighter red than yours. I was told that hematite is a fake stone that is made in China. Jim
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Deleted
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Post by Deleted on Apr 23, 2012 0:00:10 GMT -5
BTW the yellow is the bands and the red looks like a filler after the stone was brecciated. Jim
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djsparkles
noticing nice landscape pebbles
Member since June 2010
Posts: 79
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Post by djsparkles on Apr 23, 2012 8:34:22 GMT -5
I knew I should have said more *LOL*
I live in central Indiana, not far from Indianapolis. The stones were all collected from the tracks near my home, and there are lots more where they come from (winces as family growls) *LOL*
The silver one is beautiful, I agree. I'll have to tumble the first one down, then, and see what happens... you guys are great! Thanks for the help, I really appreciate it!
Pics when the process is in progress...
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Post by Jugglerguy on Apr 23, 2012 12:43:56 GMT -5
Isn't Hematite just iron ore?
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Post by Hard Rock Cafe on Apr 23, 2012 12:48:21 GMT -5
I agree with Daniel on the IDs, except I think #2 is schist. Having said that, I am easily confused between granite, gneiss, schist, diorite, gabbro, etc.
Chuck
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Minnesota Daniel
freely admits to licking rocks
A COUPLE LAKERS
Member since August 2011
Posts: 891
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Post by Minnesota Daniel on Apr 23, 2012 14:44:52 GMT -5
Chuck, I think you are right about the schist. I know the difference, but I get the names mixed-up. Too many damn consonants in a row!
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morsefire
noticing nice landscape pebbles
Member since November 2011
Posts: 83
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Post by morsefire on Apr 24, 2012 6:59:58 GMT -5
Hematite is another ore mixture and there are many of them. Most of the hematite I find is botryoidal type. If it's been unearthed for some time, it gets a very deep red color to it. Perhaps it's Goethite you have found.
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morsefire
noticing nice landscape pebbles
Member since November 2011
Posts: 83
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Post by morsefire on Apr 24, 2012 7:25:59 GMT -5
Whoops Wrong! Not goethite. Now that I saw the pictures. BTW Jaspilite is another name for BIFs.
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djsparkles
noticing nice landscape pebbles
Member since June 2010
Posts: 79
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Post by djsparkles on Apr 24, 2012 7:26:17 GMT -5
I will have to show photos, then, once it's tumbling. Right now I've an issue with my machine, but I think it's fixable. Gonna find out soon's I have some coffee *LOL*
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Minnesota Daniel
freely admits to licking rocks
A COUPLE LAKERS
Member since August 2011
Posts: 891
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Post by Minnesota Daniel on Apr 25, 2012 1:00:25 GMT -5
Clarification:
BIF is the name used for a very old sedimentary rock with alternating bands of hematite (or magnetite) and shale or chert. It was formed as a result of blue-green algae (cyanobacter actually) releasing oxygen into the oceans, causing the oxidation and precipitation of the previously dissolved iron.
A BIF of banded chert (jasper) is called jaspilite, but jaspilite can also become brecciated. A BIF of alternating bands of iron and shale is not called jaspilite however. The BIF pictures posted by Geoff previously in this thread look like shale and iron to me, not jaspilite. The rocks that the originator of the thread, djsparkles, posted links to are not BIFs at all.
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morsefire
noticing nice landscape pebbles
Member since November 2011
Posts: 83
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Post by morsefire on Apr 25, 2012 23:28:35 GMT -5
The first picture came from a BIF site but it's not a BIF. We find small amounts of these "formations". Quartz filled voids peppered with spots of granite, jasper, iron, and lord knows what. No idea what caused this but I have a few the size of footballs. daniel. There is a new theory bubbling about the formations of BIFS having to do with an asteroid collision.
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