tjm
off to a rocking start
Member since January 2015
Posts: 15
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Post by tjm on Mar 30, 2015 18:23:43 GMT -5
Hello all, I've been lurking for a bit trying to learn what I can about this new hobby my wife, 2 young sons, and I are enjoying. We've been having a great time lately picking up and tumbling every neat looking rock we can find. When I pick up a stone i generally have no idea what I'm looking at, if it looks neat it goes in the bucket I literally have dozens of rocks I'd like to get identified. I thought I'd start with one picture and try to learn something. I'm sure everything I have is pretty common/boring but here goes... My 8yo found this last weekend...shown wet... Thanks in advance for any insight...
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Post by broseph82 on Mar 30, 2015 18:38:57 GMT -5
Its awesome whatever it is!
looks almost like an Ocean Jasper. Where was it found?
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tjm
off to a rocking start
Member since January 2015
Posts: 15
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Post by tjm on Mar 30, 2015 18:43:38 GMT -5
Its awesome whatever it is! looks almost like an Ocean Jasper. Where was it found? south central AK...on a hill side, but not near the ocean...
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barclay
has rocks in the head
Lowly Padawan of rocks
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Post by barclay on Mar 30, 2015 19:33:47 GMT -5
Looks like crinoid stems to me.
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tjm
off to a rocking start
Member since January 2015
Posts: 15
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Post by tjm on Mar 30, 2015 20:15:50 GMT -5
Looks like crinoid stems to me. We have found a lot of Crinoids over the years in the area (within 50 miles).... My kids call them carrot fossils The round marks do not appear on the back aide of the rock if that helps confirm Crinoid stems...
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Deleted
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Post by Deleted on Mar 30, 2015 20:45:45 GMT -5
How hard is it?
Does a steel knife scratch it?
Does acid react with it?
Are there any broken surfaces? If so, please provide image.
Please provide image of all sides.
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tjm
off to a rocking start
Member since January 2015
Posts: 15
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Post by tjm on Mar 30, 2015 22:20:58 GMT -5
How hard is it? Does a steel knife scratch it? Does acid react with it? Are there any broken surfaces? If so, please provide image. Please provide image of all sides. A steel knife does not scratch it Acid does not react with it (the acid was diluted though) No broken surfaces I will take pictures of the back and sides when I get home this evening...are wet or dry pictures preferred ?
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Deleted
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Post by Deleted on Mar 30, 2015 22:45:47 GMT -5
tjmwet is good. Maybe one dry to show surface profile/texture. "Ocean jasper" is a trade name for some jasper that originated in the ocean on the east coast of Madagascar. It was so popular that the miners dug/collected all of it! Therefore anything that looks similar, is compared, such as yours. In OJ the eyes tend to go all the way thru, but is not required. Would you say the material is "glassy" "waxy" "grainy" or any other term to be descriptive of the "texture" of the stone? For reference: Ocean Jasper---------->
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Fossilman
Cave Dweller
Member since January 2009
Posts: 20,709
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Post by Fossilman on Mar 30, 2015 23:25:56 GMT -5
Sure looks like some kind of jasper..............
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tjm
off to a rocking start
Member since January 2015
Posts: 15
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Post by tjm on Mar 31, 2015 1:02:09 GMT -5
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Post by gingerkid on Mar 31, 2015 6:20:25 GMT -5
Hi, tjm, and Welcome to the forum! Not sure what you have there, but it is interesting and pretty. Could it be pisolitic bauxite or possibly oolite? It kinda looks like bauxite. ?? Physical Properties of BauxiteChemical Classification Color: white, gray, sometimes stained yellow, orange red, pink, brown or yellow by iron or included iron minerals Streak: usually white but iron stain can discolor Luster: dull, earthy Diaphaneity: opaque Cleavage: none Mohs Hardness: 1 to 3 Specific Gravity: 2 to 2.5 Diagnostic Properties: often exhibits pisolitic structure, color Chemical Composition: variable but always rich in aluminum oxides and aluminum hydroxides Crystal System: n/a Uses: primary ore of aluminum, also used as an abrasive Source: geology.com/minerals/bauxite.shtmlAlso found some info on the Reynolds oolite found in Southern Arkansas: archives.datapages.com/data/bulletns/1968-70/data/pg/0053/0009/1900/1909.htmShort Creek oolite: gsa.confex.com/gsa/2014AM/finalprogram/abstract_249790.htmWe have found a lot of Crinoids over the years in the area (within 50 miles).... My kids call them carrot fossils "Carrot fossils" ROFL!
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spiritstone
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Member since August 2014
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Post by spiritstone on Mar 31, 2015 7:45:25 GMT -5
Just wondering if you have sliced any open. I have something that looks close to it and not sure what I have. Keeping my eyes on this thread.
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Post by washingtonrocks on Mar 31, 2015 8:26:24 GMT -5
Oolitic Chert or Jasper would be my guess.
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Deleted
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Post by Deleted on Mar 31, 2015 10:05:24 GMT -5
Hi, tjm, and Welcome to the forum! Not sure what you have there, but it is interesting and pretty. Could it be pisolitic bauxite or possibly oolite? It kinda looks like bauxite. ?? Physical Properties of BauxiteChemical Classification Color: white, gray, sometimes stained yellow, orange red, pink, brown or yellow by iron or included iron minerals Streak: usually white but iron stain can discolor Luster: dull, earthy Diaphaneity: opaque Cleavage: none Mohs Hardness: 1 to 3 Specific Gravity: 2 to 2.5 Diagnostic Properties: often exhibits pisolitic structure, color Chemical Composition: variable but always rich in aluminum oxides and aluminum hydroxides Crystal System: n/a Uses: primary ore of aluminum, also used as an abrasive Source: geology.com/minerals/bauxite.shtmlAlso found some info on the Reynolds oolite found in Southern Arkansas: archives.datapages.com/data/bulletns/1968-70/data/pg/0053/0009/1900/1909.htmShort Creek oolite: gsa.confex.com/gsa/2014AM/finalprogram/abstract_249790.htmWe have found a lot of Crinoids over the years in the area (within 50 miles).... My kids call them carrot fossils "Carrot fossils" ROFL! Bauxite out mohs over 5. Knife does not scratch. I'm saying orbicular rhyolite. Seems too grainy and not glassy to be Jasper or chert.
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spiritstone
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Member since August 2014
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Post by spiritstone on Mar 31, 2015 10:05:34 GMT -5
If it is the same stuff I'm holding, it should have a purple agate core in some areas. Similar to this maybe. I dont know what the material is called.
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Post by gingerkid on Mar 31, 2015 10:45:08 GMT -5
Wow, spiritstone, that is beautiful stuff! Bauxite out mohs over 5. Knife does not scratch. I'm saying orbicular rhyolite. Seems too grainy and not glassy to be Jasper or chert. Good guess, @shotgunner! Didn't think of orbicular rhyolite. I read that rhyolite is found in Arkansas. Could it be pisolitic bauxite or possibly oolite? Like washingtonrocks, I was thinking along the lines that it may be oolitic chert or jasper. Maybe the "men of orbs" will know - Sabre52 and stephan??
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tjm
off to a rocking start
Member since January 2015
Posts: 15
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Post by tjm on Mar 31, 2015 12:51:05 GMT -5
Just wondering if you have sliced any open. I have something that looks close to it and not sure what I have. Keeping my eyes on this thread. No, I haven't sliced any. I'm new to this rocks stuff so no equipment yet but I am keeping my eyes open for a saw. The used market is pretty dismal up here in Alaska Thanks everyone for your comments....
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Post by gingerkid on Mar 31, 2015 13:00:05 GMT -5
oops, my apologies, tjm. I thought you lived in Arkansas. Geoff and glennz01 live in Alaska. Maybe they'll see your thread and can answer your question.
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tjm
off to a rocking start
Member since January 2015
Posts: 15
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Post by tjm on Mar 31, 2015 13:02:00 GMT -5
oops, my apologies, tjm. I thought you lived in Arkansas. Geoff and glennz01 live in Alaska. Maybe they'll see your thread and can answer your question. Lol, no worries... ...maybe they'll have some nice used equipment for sale too
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Post by glennz01 on Mar 31, 2015 13:02:40 GMT -5
Divitrified Volcanic Ash, fairly common.
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