Callahan Posted January 19, 2023 Share Posted January 19, 2023 Id please of this unique mineral found in gray mud layer under Cretaceous limestone outcrop in Texas. does not oxidize and shiny extremely hard and does no streak on ceramic Nothing like hematite or magnetite minerals I have found before. fyi I’ve posted this before Link to comment Share on other sites More sharing options...
FranzBernhard Posted January 19, 2023 Share Posted January 19, 2023 Is it heave for its size? Could you measure specific gravity? Seems to be monomineralic. Franz Bernhard Link to comment Share on other sites More sharing options...
Callahan Posted January 21, 2023 Author Share Posted January 21, 2023 Not as heavy as hematite or magnetite extremely hard. I could not Polish a side to add shine to it with belt sander how do I measure specific gravity? thank you with help. Link to comment Share on other sites More sharing options...
ynot Posted January 22, 2023 Share Posted January 22, 2023 an accurate hardness test would help narrow it down. 1 2 Darwin said: " Man sprang from monkeys." Will Rogers said: " Some of them didn't spring far enough." My Fossil collection - My Mineral collection My favorite thread on TFF. Link to comment Share on other sites More sharing options...
FranzBernhard Posted January 22, 2023 Share Posted January 22, 2023 On 1/21/2023 at 3:09 PM, Callahan said: how do I measure specific gravity? Try this one, you can use a thin string instead of a paper clip: Easy specific gravity measurement Is it harder then quartz? Can you scratch it with a pointy splinter of quartz? There are also many druzes with crystals? You found that in-situ in Cretaceous strata, so something man-made can be ruled out. There are also some whitish patches*. Are these of a different make up or just surface / lightning / photo artefacts? *Upon closer inspection, I think, there is indeed some whitish stuff (quartz?) in this stone, so its not monomineralic. And it came out that shiny? Or have you done or applied something to it? Franz Bernhard Link to comment Share on other sites More sharing options...
Callahan Posted January 25, 2023 Author Share Posted January 25, 2023 Franz, Came out like this. Just washed off. Washing did very little to nothing removing anything. i try to sand one side lightly with no luck didn’t remove any material I took a pic of it before taking out of the no fossil bearing grey clay below limestone outcrop here is rock in deposit circled. Added some from my previous post and one video of the little quartz pockets on couple places on surface. White spots do not wash off etc even if you scrub. video of me using a small screw driver to show scratches it makes in unknown rock. seems to have some sort of matrix also you can see it in videos. Tried to get shimmer of small quartz crystals. included video of it wet also. Can see crystals way better super hard. Not heavy as hematite or magnatite and no way man made slag I am a welder hope this helps in this mystery rock never found anything like this. location is north Texas. Found in gray layer right under limestone/Cretaceous outcrop originally thought naught of been some type of metallic Native American stone tool but is not. no other rocks in the layer found. Just grey clay similar to where I find selenite crystals in other areas in dfw thank you Bryan Callahan 69635525172__DE3A07BF-B247-444E-874A-C9F29E01C18A.MOV Link to comment Share on other sites More sharing options...
Callahan Posted January 25, 2023 Author Share Posted January 25, 2023 My bad. Will not let me download anymore videos 69635525172__DE3A07BF-B247-444E-874A-C9F29E01C18A.MOV Link to comment Share on other sites More sharing options...
Callahan Posted January 25, 2023 Author Share Posted January 25, 2023 Here is rock when wet video. Anyone think this could be a lunar meteorite of some sort from pre Cretaceous period. was embedded and looked to be deposited in that layer and not washed from another layer the non magnetic type? i know this is very unlikely and rare but any possibility and any recommendations where to have it looked at in dfw area Texas? IMG_0725.MOV IMG_0725.MOV Link to comment Share on other sites More sharing options...
JohnJ Posted January 25, 2023 Share Posted January 25, 2023 I doubt meteorite. It has several characteristics of an iron-based rock, like hematite. @ynot 1 2 The human mind has the ability to believe anything is true. - JJ Link to comment Share on other sites More sharing options...
FranzBernhard Posted January 26, 2023 Share Posted January 26, 2023 12 hours ago, JohnJ said: It has several characteristics of an iron-based rock, like hematite. Could be an intimate mixture of hematite and quartz, yes. Not magnetic, so not magnetite, but martite (pseudomorph of hematite after magnetite) is a possibility. I am wondering about the druzes? Imprints of dissolved carbonates? Franz Bernhard 1 Link to comment Share on other sites More sharing options...
ynot Posted January 26, 2023 Share Posted January 26, 2023 ?? Possibly a carbon rich chert gastrolith? 1 Darwin said: " Man sprang from monkeys." Will Rogers said: " Some of them didn't spring far enough." My Fossil collection - My Mineral collection My favorite thread on TFF. Link to comment Share on other sites More sharing options...
FranzBernhard Posted January 26, 2023 Share Posted January 26, 2023 40 minutes ago, ynot said: Possibly a carbon rich chert gastrolith? Wow! Specific gravity measurement urgently needed! Franz Bernhard Link to comment Share on other sites More sharing options...
Callahan Posted January 26, 2023 Author Share Posted January 26, 2023 Franz. Do I need to have a professional measure specific gravity? need special equipment? I prob already asked this and very much a novice with minerals . Thank you sir with Al the in depth knowledge and recommendations on this to me unusual rock. 1 Link to comment Share on other sites More sharing options...
JohnJ Posted January 26, 2023 Share Posted January 26, 2023 49 minutes ago, ynot said: ?? Possibly a carbon rich chert gastrolith? You may not have seen the video where Bryan easily scratched the surface. The human mind has the ability to believe anything is true. - JJ Link to comment Share on other sites More sharing options...
Callahan Posted January 26, 2023 Author Share Posted January 26, 2023 I’m to afraid to knap a piece off to see if chert/flint likeness if has a possibility of rare. I’m sure it’s not rare. Link to comment Share on other sites More sharing options...
FranzBernhard Posted January 26, 2023 Share Posted January 26, 2023 (edited) 23 minutes ago, Callahan said: Franz. Do I need to have a professional measure specific gravity? No, very simple, see the linked video. A kitchen scale with 1 g resolution, a beaker with water and a string. That´s all. 23 minutes ago, Callahan said: unusual rock. Unusual in this context to me, too! 19 minutes ago, JohnJ said: You may not have seen the video where Bryan easily scratched the surface. Also not seen that! With a screwdriver? Which head? What was the color of the powder? 9 minutes ago, Callahan said: I’m sure it’s not rare. I also don´t think its rare. But such fine-grained mixtures are tricky. I think, I was very wrong supposing a monomineralic rock! Another guess: Tourmaline-quartz-rock. Hardness test can be deceiving on mixtures and rocks in general. Franz Bernhard Edited January 26, 2023 by FranzBernhard Link to comment Share on other sites More sharing options...
Callahan Posted January 26, 2023 Author Share Posted January 26, 2023 Sounds good will research this and get back with results used Philips head small screwdriver. No powder and rock was extremely hard. Barely scratch surface if not. Silver scratch could of been screwdriver metal seemed I could wipe off scratch with my hand Nothing came off rock. Link to comment Share on other sites More sharing options...
Callahan Posted January 26, 2023 Author Share Posted January 26, 2023 Natural polished tormouline looks really close. Minus Though very silver metal color Link to comment Share on other sites More sharing options...
FranzBernhard Posted January 26, 2023 Share Posted January 26, 2023 27 minutes ago, Callahan said: Silver scratch could of been screwdriver metal seemed I could wipe off scratch with my hand Nothing came off rock. Silver scratch is from screwdriver, yes. Tourmaline-quartz-rock is indeed an option than! But silver-metal color is indeed off for tourmaline. Big puzzle! Franz Bernhard. Link to comment Share on other sites More sharing options...
JohnJ Posted January 26, 2023 Share Posted January 26, 2023 1 hour ago, Callahan said: used Philips head small screwdriver. No powder and rock was extremely hard. Barely scratch surface if not. Silver scratch could of been screwdriver metal seemed I could wipe off scratch with my hand Nothing came off rock. Bryan are there any marks/scratches on the rock from the screwdriver? It looked like it in the video. I think you could find a dino egg where you found this stone before you could find a chunk of tourmaline...the geology is all wrong (so, no to tourmaline or an egg. ) 1 The human mind has the ability to believe anything is true. - JJ Link to comment Share on other sites More sharing options...
ynot Posted January 26, 2023 Share Posted January 26, 2023 6 hours ago, JohnJ said: You may not have seen the video where Bryan easily scratched the surface. Streak from screwdriver not a scratch. Scratches do not wipe off. Darwin said: " Man sprang from monkeys." Will Rogers said: " Some of them didn't spring far enough." My Fossil collection - My Mineral collection My favorite thread on TFF. Link to comment Share on other sites More sharing options...
ynot Posted January 26, 2023 Share Posted January 26, 2023 6 hours ago, Callahan said: if has a possibility of rare. None whatsoever! Darwin said: " Man sprang from monkeys." Will Rogers said: " Some of them didn't spring far enough." My Fossil collection - My Mineral collection My favorite thread on TFF. Link to comment Share on other sites More sharing options...
JohnJ Posted January 26, 2023 Share Posted January 26, 2023 12 minutes ago, ynot said: Streak from screwdriver not a scratch. Scratches do not wipe off. Here is what I saw and why I've asked if there are marks or scratches. Screenshots as the rock is scratched and immediately after it was wiped with his thumb. The human mind has the ability to believe anything is true. - JJ Link to comment Share on other sites More sharing options...
FranzBernhard Posted January 27, 2023 Share Posted January 27, 2023 Pics are too fuzzy, sorry! Franz Bernhard Link to comment Share on other sites More sharing options...
Callahan Posted January 27, 2023 Author Share Posted January 27, 2023 Will make a better video scratching it etc. video quality was pretty crappy. I will have my wife hold while scratching etc and get back to you. ”that’s what she said” -a joke Link to comment Share on other sites More sharing options...
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