mjflinty
spending too much on rocks
Member since September 2011
Posts: 356
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Post by mjflinty on Jul 25, 2021 10:20:43 GMT -5
Thank you everyone for the well wishes! A good time was had :-)
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mjflinty
spending too much on rocks
Member since September 2011
Posts: 356
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Post by mjflinty on Jul 16, 2021 18:44:52 GMT -5
Looks like chert to me. I saw a good bit in glacial gravels and it had the same colors and inclusions as your sample.
Michael
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mjflinty
spending too much on rocks
Member since September 2011
Posts: 356
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Post by mjflinty on Jun 5, 2021 6:51:01 GMT -5
You found oolitic chert. The fracture is conchoidal and the squareish spots are fairly common on cherts as they weather and break apart naturally.
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mjflinty
spending too much on rocks
Member since September 2011
Posts: 356
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Post by mjflinty on Mar 5, 2021 18:56:46 GMT -5
Nice work as always! Good to see you chipping!
All the best, Michael
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mjflinty
spending too much on rocks
Member since September 2011
Posts: 356
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Post by mjflinty on Feb 27, 2021 18:41:36 GMT -5
Always enjoy seeing Neathers Flint Ridge polished up. I must have 50 pounds of slabs of it set back waiting for me to find some time at the wheel!
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mjflinty
spending too much on rocks
Member since September 2011
Posts: 356
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Post by mjflinty on Feb 16, 2021 8:57:24 GMT -5
If you see air bubbles... it is probably man-made glass. If you are after Green Obsidian, look up Burns Green Obsidian it is pretty green.
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mjflinty
spending too much on rocks
Member since September 2011
Posts: 356
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Post by mjflinty on Feb 12, 2021 9:21:32 GMT -5
Hello all,
Sorry I didn't see this earlier, I have been moving and with all the rocks I have it kicked my butt!
As an archaeologist with a specialization in stone tools, I have seen many artifacts over the past 30 years and I have also seen a lot of geofacts. In fact, I have a talk I give that addresses both. The technology that was used to manufacture chipped stone tools (arrowheads) and ground stone (axes, bannerstones, gorgets) leave distinctive traces on the artifact. Flaked stone will have scars on the surface from the removal of chips and ground stone will be marked with pits from pecking and some areas may show smoothing from it being ground to shape. Nature is a powerful force that can shape stones too. A geofact is a stone that has been modified by weathering and erosion. Often a stone that has different types of minerals in it will have different layers or spots that wear away at different rates due to hardness differences. Think about a dense limestone with a soft fossil in it... the soft fossil will wear away faster than the surrounding matrix to the point that it may leave a hole in the stone. The opposite is also true; a hard chert nodule in limestone will resit weathering and the limestone erodes away leaving (sometimes) a oddly shaped nodule of chert.
It's always challenging to tell from a picture... I don't think the sandstone or the chert nodule you posted are artifacts. It gets tricky when stones like these are found at an archaeological site; people have always collected rocks and they may have picked up the sandstone thinking they'd make something. It gets left at a site with other artifacts and if the site is excavated properly we can discern if it was intentionally brought to the site based on where it was found in relation to other diagnostic artifacts. If that's the case, it would be classified as a manuport and considered an artifact since it was carried to the site for some purpose.
Hope this helps! Michael
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mjflinty
spending too much on rocks
Member since September 2011
Posts: 356
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Post by mjflinty on Jan 13, 2021 18:02:01 GMT -5
Dang, that's a nice job! Makes me want to fix up mine! Good work.
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mjflinty
spending too much on rocks
Member since September 2011
Posts: 356
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Post by mjflinty on Jan 13, 2021 17:59:06 GMT -5
This one made my LOL. Nice work!
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mjflinty
spending too much on rocks
Member since September 2011
Posts: 356
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Post by mjflinty on Jan 13, 2021 17:56:48 GMT -5
Down right.. wow... all of them!
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mjflinty
spending too much on rocks
Member since September 2011
Posts: 356
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Post by mjflinty on Nov 1, 2020 9:26:47 GMT -5
Thank you everyone for the ideas. I hope to get my trim saw out an get to work on this stone soon. One idea I had was business card holders. Still open to other ideas!
All the best, Michael
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mjflinty
spending too much on rocks
Member since September 2011
Posts: 356
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Post by mjflinty on Oct 29, 2020 6:23:06 GMT -5
Hello All, I have a large amount of what I believe to be Italian Marble (could be wrong) from a historic house that has been torn down. The marble was part of the fireplace and was cracked in many places. Firstly, is this material good? If so, what kind of projects could I do with it? Any ideas? All the best, Michael
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mjflinty
spending too much on rocks
Member since September 2011
Posts: 356
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blanks
Oct 23, 2020 16:24:58 GMT -5
Post by mjflinty on Oct 23, 2020 16:24:58 GMT -5
You always know it's good stuff when the rocks are in old milk cartons!
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mjflinty
spending too much on rocks
Member since September 2011
Posts: 356
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Post by mjflinty on Aug 12, 2020 18:56:13 GMT -5
Chert most likely.
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mjflinty
spending too much on rocks
Member since September 2011
Posts: 356
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Post by mjflinty on Jun 7, 2020 12:43:24 GMT -5
Neat experiment. When I tried this, I planned on using the stone for flintknapping (making stone tools) so I broke it down into rough preforms. I found the heat penetrated the outer portion of the stone and several thicker pieces (2+ inches) did not get heat treated in the middle and needed to be worked down and heated again. You will likely see the same thing in the large piece you heated. Looking forward to seeing your results.
Michael
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mjflinty
spending too much on rocks
Member since September 2011
Posts: 356
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Post by mjflinty on Dec 9, 2019 18:25:44 GMT -5
Well, it's not a field trip, but you'll have a good time visiting the V-Rock Shop in North Canton. www.vrockshop.com/I grew up in the Canton Ohio area and the only rocks you'll find there are limestone, sandstone, and some shale. Some of these contain fossils, but they don't outcrop in the Canton area and I can't think of any areas open to public collecting. All the best, Michael
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mjflinty
spending too much on rocks
Member since September 2011
Posts: 356
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Post by mjflinty on Dec 7, 2019 11:32:00 GMT -5
Insightful! Good reading. Thank you for posting.
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mjflinty
spending too much on rocks
Member since September 2011
Posts: 356
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Post by mjflinty on Sept 26, 2019 18:04:20 GMT -5
The one with shell fossils is Burlington Chert, your local chert, used widely by natives to make stone tools.
Michael
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mjflinty
spending too much on rocks
Member since September 2011
Posts: 356
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Post by mjflinty on Sept 4, 2019 16:47:37 GMT -5
Always a pleasure to do business with Shawn!
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mjflinty
spending too much on rocks
Member since September 2011
Posts: 356
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Post by mjflinty on Aug 3, 2019 7:02:34 GMT -5
Got some good color there! Hope all is well!
Michael
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