lincoln
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Post by lincoln on Jun 6, 2021 6:02:18 GMT -5
I want confirmation on theese suspected Ferroginous quartz specimens. Originally i had hopes it was Jasper but ive been told we dont have it and that i likely have Ferroginous quartz. I have since then tried to learn more of this material. Have done lots of image searches and the problem is i dont find any picture remotely similar to what ive got here to verify my findings. Most examples i find are crystals with points and mostly semi translucent. I found a few examples of similar looking stone but it was full of specks of white/milky quartz again nothing i find in my samples i have the one with the banding that would be closest but its still looking very different. EDIT: As you can see this rock often has pores/pits in it unlike any other kind of qusrtz ive dealt with. Same goes for breakage this does not fracture as my Milky quartz would for example.
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Post by Peruano on Jun 6, 2021 6:22:49 GMT -5
Where is the material from? When you cut it is it as red all the way through or is the red restricted to the outer edges? The material I find like that around central New Mexico often gets considered as red jasper but in fact is probably quartzites stained by iron oxidation.
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lincoln
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Post by lincoln on Jun 6, 2021 6:28:43 GMT -5
Where is the material from? When you cut it is it as red all the way through or is the red restricted to the outer edges? The material I find like that around central New Mexico often gets considered as red jasper but in fact is probably quartzites stained by iron oxidation. Sorry forgot to put that in my original post. Im across the pond in Sweden. We do have plenty of iron in my area both magnetite and hematite are abundant. The material is the same all the way threw. The piece to the far left i broke yesterday.
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Post by Peruano on Jun 6, 2021 6:40:46 GMT -5
If you have not consulted the section on this type of quartz in the quartzpage.de you probably should do so. Clearly the term of feruginous quartz is thrown around loosely on the internet and the rock community and sometimes refers to quartzites as I did above and sometimes to a more crystal-form of quartz that has iron as a source of the reddish color.
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lincoln
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Post by lincoln on Jun 6, 2021 7:11:06 GMT -5
If you have not consulted the section on this type of quartz in the quartzpage.de you probably should do so. Clearly the term of feruginous quartz is thrown around loosely on the internet and the rock community and sometimes refers to quartzites as I did above and sometimes to a more crystal-form of quartz that has iron as a source of the reddish color. Will consult them for sure. But a quick look at their page what i have i believe is what they call eisenkisel wich its called järnkisel in Swedish. Järn meaning iron in Swedish. Wich is assosiated with the red color. If im on the right track that is. EDIT: Upon further reading about eisenkisel it does not seem quite right either. They soley talk about crystals translucent to rarely opaque. Wich does not fit my reality i find theese stones beeing quite abundant. Also translating järnkisel to english lead me to Ferroginous quartz. But language and seemingly confusion about the names may play a role here as well im starting to feel
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lincoln
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Post by lincoln on Jun 6, 2021 7:27:22 GMT -5
If you have not consulted the section on this type of quartz in the quartzpage.de you probably should do so. Clearly the term of feruginous quartz is thrown around loosely on the internet and the rock community and sometimes refers to quartzites as I did above and sometimes to a more crystal-form of quartz that has iron as a source of the reddish color. I dont find a way to consult them dierectly either. And it seems the page has not been active since 2011? Atleast not the news section.
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lincoln
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Post by lincoln on Jun 6, 2021 7:36:19 GMT -5
Upon searching images namedv eisenkisel i found this: linkResembles one of my examples. Question now is are the others the same rock. Its fairly recently broken it looks like and i cant see any porous inclusions in it as with the other examples, they all have been river tumbled abit tho. I mostly find the red ones. The one with the stripes is a much rarer find to me.
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Post by Peruano on Jun 6, 2021 11:25:52 GMT -5
www.quartzpage.de/ I agree, there seems to be a group of findings that are largely crystals which I don't see in your material. Then there are a lot of stones that are obviously largelly quartz with heavy iron stains or infusions. I think the terminology is sloppy. I would be useful to see a better picture of a freshly broken surface or of any fractures that might be obvious.
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lincoln
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Post by lincoln on Jun 6, 2021 15:30:21 GMT -5
Im out of sunlight for today so will come back tomorrow with a picture with fresh cleavage.
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lincoln
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Post by lincoln on Jun 7, 2021 6:47:46 GMT -5
So i cracked a couple specimens. And if you look at the bottom left it appesrs to have inclusions of mica? Or something similar looking. That would explain the pits in the rocks. Its abit out of focus but it was the only way i got the mica to really show...
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Post by rmf on Jun 7, 2021 10:07:28 GMT -5
lincoln the fracture (not cleavage) does not look like jasper and the luster appears earthy. Check hardness against quartz. My guess is you have Rhyolite some may have more quartz in it. It should polish but not as highly as jasper. Also larger image would help, I am old and my eyes don't see the fine detail like they use to. Rhyolite should have a hardness around 6 and quartz should be 7 so it should easily scratch.
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lincoln
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Member since May 2021
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Post by lincoln on Jun 7, 2021 12:27:21 GMT -5
Thanks for correcting me im still learning about the correct terminologies so any pointers is gladly accepted.
Ive ruled out jasper before i even posted as stated its not even found here in Sweden (sadly).
Did as you said and tried to scratch a sample with a sharp piece of quartz, first looked liked it had scratched but after rubbing the surface revealed that it was mostly a streak deposited from the quartz. Did lots of hard scratching and it seems i may have got some minor scratches barely visible. My limited knowledge tells me their quite equal in hardness? I have little experience but when you say easily scratch i take ot as i would def have cut into the material slightly...
Im sorry for the horrible photos. I will borrow a real camera and comenback with some better pictures. I have a hard time letting theese go unidentified! 😂
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Post by rmf on Jul 2, 2021 3:08:20 GMT -5
lincoln Your original image #1 lower right corner appears to be brecciated quartzite. Other pick where you crack appear to be rhyolite. Your hardness test sounds like the rock you are scratching is about the same hardness as the quartz.
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