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Pete Modreski Replies: 6 Views: 626 |
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Hi Daniel, seems that only one picture made it attached?
I've been there and like these kinds of rocks, but probably don't know enough to offer a sure guess or confirmation tho! Pete |
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Pete Modreski Replies: 12 Views: 1402 |
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Viewing your pictures again--considering the intergrown rutile--yes, I agree with what's been suggested, for sure, hematite with rutile, from Brazil. | |
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Pete Modreski Replies: 12 Views: 1402 |
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When two minerals are both quite hard and are of comparable hardness, it can be quite difficult to do a reliable hardness scratch test; it sounds like both it and quartz are "near 7" in hard ... | |
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Pete Modreski Replies: 6 Views: 1227 |
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'Tis glass, alas!
Some intentionally produced glass for decorative use, or industrial slag glass, may have unmelted chunks of limestone or quartzite or flint in it, that haven't all dissolved in ... |
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Pete Modreski Replies: 7 Views: 1418 |
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I believe you've studied the specimen well and done the tests correctly, Angel, congratulations! Your concluded answer is what I would have said from your descriptions.
I had been writing a longer ... |
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Pete Modreski Replies: 19 Views: 5977 |
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It has been a most enjoyable and useful Forum and 15 years, Jordi, thank you for the idea and for doing it! And I've met many fine people through it. | |
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Pete Modreski Replies: 7 Views: 2135 |
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Yes, definitely, we'd just call it "massive".
Looks like it's criss-crossed by veins & patches of some other, dark mineral, probably some other sulfide. Could be any of a great numbe ... |
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Pete Modreski Replies: 5 Views: 5729 |
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If it's in vugs associated with galena & anglesite, I would guess it's most likely linarite. Let us know what your acid test turns out to show? | |
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Pete Modreski Replies: 15 Views: 7771 |
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Dear Alea,
As our list moderator James Catmur explained, this site, this Forum, though our title does not clearly explain this, is really aimed at mineral collectors who want to share information a ... |
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Pete Modreski Replies: 3 Views: 1773 |
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Peter Megaw's comments should be very helpful to you, about it appearing to be some form of (something-replaced-by) silica, with a fibrous structure. It simply being petrified (silicified) wood is a ... | |
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Pete Modreski Replies: 20 Views: 6486 |
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Thank you, Jordi, for creating and sponsoring the Forum! It has always been a source of much information and interesting reading (and viewing), and your past work, and the new sponsorship, are all ve ... | |
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Pete Modreski Replies: 10 Views: 4337 |
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Charly, some rocks are just dirty and weathered enough, and have enough insoluble mineral crusts on them, that they are either just impossible to clean, or would require such repeated and "exotic ... | |
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Pete Modreski Replies: 5 Views: 2540 |
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Cornel, I quite agree with Kevin, about this being most likely a piece of some kind of furnace slag; for all the reasons that he states. But my compliments, too, for your doing such a good job of des ... | |
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Pete Modreski Replies: 10 Views: 3998 |
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That is all very good advice about your rock that you received from Pete Megaw.
Likewise, Pete Richards' suggestion is good--I also thought that its shape "might" suggest some kind of fo ... |
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Pete Modreski Replies: 1 Views: 2427 |
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Very nice! From Cornwall, of course? I once got to attend a conference on granites, in St. Austell. | |
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Pete Modreski Replies: 9 Views: 4061 |
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Alfredo's fire retardant suggestion like it may be "right on", a very good thought. I would never have thought of this! (I've probably never seen fire retardant that was actually sprayed ... | |
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Pete Modreski Replies: 10 Views: 4679 |
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This appears to be a quartz-mica schist; the presence of the mica (all the sparkling flakes, of course) would account for the other elements (K, Ca, Mg, Fe, Al) that show up in the X-ray spectrum.
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Pete Modreski Replies: 7 Views: 3414 |
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Yes, you clearly have a large rock nodule, with agate in the center. Being as it's evidently a large heavy rock, it's most likely your grandpa got it from somewhere in your local area, or at least, yo ... | |
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Pete Modreski Replies: 3 Views: 22328 |
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I'll agree, that this is most likely pyrite, Aetherian. Likely mixed with quartz (if there's obvious white mineral material with it). If the whole rock is pyrite, it should feel REALLY heavy.
If ... |
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Pete Modreski Replies: 12 Views: 5608 |
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Elena,
That first side of the rock, your first picture, looks very much like granite--exactly like granite. it seems! (Though as was mentioned, gravel derived from decomposed granite, can be very s ... |
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