Magnetism in Catoctin Basalt

dixieshedhunter
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11:06 PM - Oct 10, 2018 #1

Badger's analysis of Catoctin metabasalt finds an iron content of around 13+ percent across three flows. Some of this must manifest as magnetite.



This is typical across my samples-but the dikey stuff has a weaker pull.

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VirginiaKnapper
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1:38 AM - Oct 11, 2018 #2

I have read that the ring given off by a certain Sandstone is due to iron impregnation, so could rhis basically be the same thing.

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VirginiaKnapper
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1:39 AM - Oct 11, 2018 #3

?

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"Nothing like busting out a Savannah River out of some gnarly shit." - Robert Godshall, 1st annual ThunderRidge knap in.
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dixieshedhunter
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1:59 AM - Oct 11, 2018 #4

Hematite and limonite in the sandstone ores. Cacapon!

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dixieshedhunter
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1:24 AM - Oct 12, 2018 #5

chisel








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VirginiaKnapper
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1:27 PM - Oct 12, 2018 #6

Nice! Does it have a ring?

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dixieshedhunter
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12:44 AM - Oct 13, 2018 #7

Greenstones always ring.
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VirginiaKnapper
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12:45 AM - Oct 13, 2018 #8

I'm guessing some more than others, what material often rings the loudest, like the shockwave material?

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"Nothing like busting out a Savannah River out of some gnarly shit." - Robert Godshall, 1st annual ThunderRidge knap in.
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Forager
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2:50 AM - Oct 15, 2018 #9

Pete I applaud your persevering spirit of inquiry both experimental and scholastic, knowing that you not only make your tools but also put them to work as a craftsman acquainted with their requirements.  Even more so since you are making primitive tools intended to fulfill primitive task behaviors - here lies the satisfaction of Experimental Archaeology.  Thanks for your leading example.

This comment may not address the question, but NJ argillite was once known as the "Jingler" as it rings not only when struck but when the flakes hit the ground.  Same is true for the Mt Kineo rhyolite of Maine - this material nearly sings when struck.  Doubtless, each are composed of different materials formed under variant processes, suggesting that some other dynamic in their formation leaves them ringing when struck.  Others also pronounce their sonorous tones and musical 'lithiphones' have been constructed for the sake of their sonic effects.  

Is there some meaning beyond the soundness of a flakable core or the pleasant sound it delivers when struck aside from this auditor aesthetic?
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VirginiaKnapper
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1:07 AM - Oct 16, 2018 #10

Would that be core foundation of rock music? At a recent workshop with Erret Callahan and others, he picked up a dagger preform and started beating it gently with his sandstone hammerstone, stating "Just like a musical instrument." That Danish Flint does have a mighty fine ring.

On a separate, but related note, I found that the quality of stone will also heavily influence its ring, I almost went temporarily deaf attempting block - on - block with a large cobble if Irish Creek Diabase. Another cobble, collected from close proximity, is far more grainy, and does not have much of a ring.

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dixieshedhunter
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8:30 PM - Oct 16, 2018 #11

Irish Creek Diabase? Picture! If you look at my axe thread elsewhere on this forum, that's where my cobble came from.

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VirginiaKnapper
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1:25 AM - Yesterday #12

Will do!! Just the War - Bells in particular, or the whole stash?
"It's about what you learn, not what you make" - Erret Callahan
"Nothing like busting out a Savannah River out of some gnarly shit." - Robert Godshall, 1st annual ThunderRidge knap in.
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dixieshedhunter
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1:30 AM - Yesterday #13

Show yer pile!



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VirginiaKnapper
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1:33 AM - Yesterday #14

      Will Do!!! Where did that there stash originate from?
"It's about what you learn, not what you make" - Erret Callahan
"Nothing like busting out a Savannah River out of some gnarly shit." - Robert Godshall, 1st annual ThunderRidge knap in.
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dixieshedhunter
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1:40 AM - Yesterday #15

Some Blue Ridge down here-some Front Royal.
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VirginiaKnapper
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2:30 AM - Yesterday #16

Oh, okay. How do you go about reducing those larger specimens?

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"Nothing like busting out a Savannah River out of some gnarly shit." - Robert Godshall, 1st annual ThunderRidge knap in.
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dixieshedhunter
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11:52 AM - Yesterday #17

You batter until you tatter. The big plates I just look at-to get a tool you had better start off as close as you can. Every peck counts. Unlike catoctin, I can hardly flake the intrusive stuff. It's super hard. Looking forward to some edge testing soon.

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VirginiaKnapper
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7:10 PM - Yesterday #18

I as well. What is the difference between Intrusive and Catoctin?

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"Nothing like busting out a Savannah River out of some gnarly shit." - Robert Godshall, 1st annual ThunderRidge knap in.
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Woodland Roamer
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12:41 PM - Today #19

Nice chisel and nice pile sir.

Alan
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