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Post by cabby on Jul 24, 2024 12:24:47 GMT -5
I’ve spent the past week or so being indecisive about whether I should cut this rock open or not. I can’t find any hint of a fresh face so not sure what the minerals are… it’s brown, magnetic, pocked, no acid reaction. My guess would be brecciated basalt with quartz, but not sure why he would want something like that…. figured I should check for other ideas before I mutilate it! ![](https://res.cloudinary.com/forum-rocktumblinghobby-com/image/upload/v1721841704/nv4wcqas29h9e3mpedfh.jpg) ![](https://res.cloudinary.com/forum-rocktumblinghobby-com/image/upload/v1721841703/iacwmhkg8c9dji8smxcb.jpg) ![](https://res.cloudinary.com/forum-rocktumblinghobby-com/image/upload/v1721841704/kkb35brf5o0b0n4jin0f.jpg)
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realrockhound
Cave Dweller
Chucking leaverite at tweekers
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Post by realrockhound on Jul 24, 2024 12:33:39 GMT -5
Looks like common jasper. Just cut the face off
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Post by cabby on Jul 24, 2024 12:52:17 GMT -5
Looks like common jasper. Just cut the face off Saw is running! Hopefully I am not destroying a priceless specimen 😆 the guy that collected this stuff spent his whole life in the same house about 2hr from where I live now, so had a lot of the same rocks I do. Looks a heck of a lot like my local basalt after it’s been tumbled by glaciers, but would be strange for him to bother buying or picking that up…
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realrockhound
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Chucking leaverite at tweekers
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Post by realrockhound on Jul 24, 2024 13:08:16 GMT -5
Looks like common jasper. Just cut the face off Saw is running! Hopefully I am not destroying a priceless specimen 😆 the guy that collected this stuff spent his whole life in the same house about 2hr from where I live now, so had a lot of the same rocks I do. Looks a heck of a lot like my local basalt after it’s been tumbled by glaciers, but would be strange for him to bother buying or picking that up… Youd be surprised how much “junk” I bring home. I pick a lot of stuff up, get it home, cleaned up, then I end up dumping it along the River back as filler to keep the bank from eroding when it floods.
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Post by cabby on Jul 24, 2024 13:27:30 GMT -5
Since our property is basically a hill of rocks anyway, I just toss the rejects anywhere that won’t get in the way of mowing! Had various “rock gardens” on the property already so I typically add to those. Pick up whatever looks interesting, clean it off, then put in a bucket to cut open later or toss into one of the gardens or piles (have piles of rocks dug from when the garage was built as well as pile of rocks that didn’t get used next to the old fieldstone stable foundation)
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Post by cabby on Jul 24, 2024 14:29:04 GMT -5
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realrockhound
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Chucking leaverite at tweekers
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Post by realrockhound on Jul 24, 2024 14:33:00 GMT -5
About what I expected
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Post by cabby on Jul 24, 2024 14:38:54 GMT -5
So when you say “common jasper” do you mean basically mudstone type things that have high silica? It’s a lot less crumbly than my local mudstones but those are the only thing I’ve found those suspended flakes in. Whatever that is lol.
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realrockhound
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Chucking leaverite at tweekers
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Post by realrockhound on Jul 24, 2024 14:49:25 GMT -5
So when you say “common jasper” do you mean basically mudstone type things that have high silica? It’s a lot less crumbly than my local mudstones but those are the only thing I’ve found those suspended flakes in. Whatever that is lol. I dunno. I generalize a lot of material. I suppose what I mean is just some random jasper piece with no known deposit. Out here you’ll just find random pieces laying around. Some nice, most undesirable for lapidary purposes. But I wouldn’t put much weight in my opinions. I have certain things I look for that make one rock nicer from another.
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Post by cabby on Jul 24, 2024 15:03:54 GMT -5
realrockhound I generalize too, which is why I need to ask what other people mean! Any brownish jaspery thing in my yard gets called “mudstone”. I think it’s technically all red shale, but whatever. So far all of my jasper has been bright red or the dull chert tans and greys, while all of the browns have been crumbly and often have microscopic fossils (but also have “globs” of solid brown that are jasper).
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Post by vegasjames on Jul 24, 2024 18:33:13 GMT -5
So when you say “common jasper” do you mean basically mudstone type things that have high silica? It’s a lot less crumbly than my local mudstones but those are the only thing I’ve found those suspended flakes in. Whatever that is lol. Jasper in an opaque chalcedony, as is chert/flint.
If that had clarity, then it would be a type of chalcedony known as sard. The dark drown sard is absolutely beautiful when cabbed.
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ThomasT
has rocks in the head
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Post by ThomasT on Jul 24, 2024 18:39:44 GMT -5
It's saleable material. Polish a piece.
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