Got A Rock you Want Identified? Post it here! gimme a good picture or 3 or 4!

[Eu_citzen]

I found this specimen near a copper mine in the mountains of Peru (Toromocho Mine). I know they have some Molybdenum there as well. Any ideas?

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Chalcopyrite or pyrite. Do a hardness test; the chalcopyrite can be scratched with a knife. Pyrite can not.

 

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[goodolejim]

Hello! I'm a teacher who holds a planetary science degree, but haven't field tested anything within the geology field for years. A student brought this in from Costa Rica. Any guesses?

 

[JM2855]

Weather worn sea shells. Most likely from a shoreline or an ancient one at least. The porous holes happen as the calcium degrades over time. The picture on the left looks to be the inside edge of a clam type shell. If you look at clam shells you can see that the inside edge of them has a coloration change in the shell, very similar to the coloration change in that piece. The picture on the right appears to be the layering effect of calcium on a large shell type marine organism. This is the layering you see on conch shells and other shells and shows 'growth rings' or layers in the shell, much like a tree shows rings in it's core as it grows.

 

[goodolejim]

Weather worn sea shells. Most likely from a shoreline or an ancient one at least. The porous holes happen as the calcium degrades over time. The picture on the left looks to be the inside edge of a clam type shell. If you look at clam shells you can see that the inside edge of them has a coloration change in the shell, very similar to the coloration change in that piece. The picture on the right appears to be the layering effect of calcium on a large shell type marine organism. This is the layering you see on conch shells and other shells and shows 'growth rings' or layers in the shell, much like a tree shows rings in it's core as it grows.

Alas, so I was right! It was easy to tell that we were dealing with something calcium-rich, thus sea shells were the perfect match. Thank you for your response.

 

[geotaughtme]

Got a couple that stumped me. This is about the size of a nerf football but very heavy. I'll others later. The "kimberlite" that weighed 41.4 pounds was full of small grains of gold and many different gems "mostlygarnets" I haven't finished and got total on gold but there is something shiny thats heavier than gold I'm assuming its platinum but its shiny-dull and kinda rare for North Carolina. U'm running test now, but what is this?

 

[Ashleyann213]

I found this rock and was wondering if it was possibly some type of meteorite. It is magnetic and sets off the metal detector. Do you have any I'd what exactly what I found?

 

[arizau]

View attachment 1453534 I found this rock and was wondering if it was possibly some type of meteorite. It is magnetic and sets off the metal detector. Do you have any I'd what exactly what I found?

Meteor Right or Meteor Wrong?.........Check some sites on this link to help you determine on your own. https://www.google.com/search?q=met...5i39l2j0l3.10135j0j7&sourceid=chrome&ie=UTF-8

It looks not to be a meteorite. The stone probably includes iron minerals of some type and a scratch test will help you identify it/them.

Good luck.

 

[Eu_citzen]

Got a couple that stumped me. This is about the size of a nerf football but very heavy. I'll others later. The "kimberlite" that weighed 41.4 pounds was full of small grains of gold and many different gems "mostlygarnets" I haven't finished and got total on gold but there is something shiny thats heavier than gold I'm assuming its platinum but its shiny-dull and kinda rare for North Carolina. U'm running test now, but what is this? View attachment 1453059 View attachment 1453060 View attachment 1453061

What ever it is, it could have sulphides in it, I'm guessing. The pics don't really give off many hints as to its identity.

 

[Eu_citzen]

View attachment 1453534 I found this rock and was wondering if it was possibly some type of meteorite. It is magnetic and sets off the metal detector. Do you have any I'd what exactly what I found?

I agree with Arizau. Appears terrestrial. Magnetism & detector reaction is likely due to magnetite. A hot rock!
A streak test will confirm. (google it!)

 

[Ashleyann213]

 

[EastCoastmetal]

View attachment 1453534 I found this rock and was wondering if it was possibly some type of meteorite. It is magnetic and sets off the metal detector. Do you have any I'd what exactly what I found?

A meteorite has a smooth surface with dimples etc but with no holes, ie melted /fused looking on the outside,with no pointy edges,unless its broken or chipped after the fact, yes they are magnetic , this video might help you determine if its real or not. Towards the end he tells you how to "grind" with 40 grit or so a flat section and look for iron flexes or chondrules (a spheroidal mineral grain present in large numbers in some stony meteorites) .

I always try to keep a look out for them when I am out and about, if I remember that is , some meteorites can be worth a bit of money.

 

[srsos]

Found on the South Fork of the Eel River in Southern Humboldt County, Ca. 1995 after a mudslide revealed it. Mountain agate? It is the size of a baseball. I put a flashlight under it on the pic on the left. Thanks in advance!

 

[Eu_citzen]

Found on the South Fork of the Eel River in Southern Humboldt County, Ca. 1995 after a mudslide revealed it. Mountain agate? It is the size of a baseball. I put a flashlight under it on the pic on the left. Thanks in advance!

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I don't care much for those labels. I'd just call it agate.

 

[Stephydee]

Muscovite?

Oh, ty ty ty.... It does look like muscovite!!!

 

[geotaughtme]

Anybody got a clue? Closest I found was a peacock ore?

 

[geotaughtme]

 

[FFFPatriot]

Is this a meteorite?

 

[geotaughtme]

What are these I cant come close to figuring them out?

 

[arizau]

Is this a meteorite? View attachment 1454798 View attachment 1454803

Probably impossible to identify by picture but check this link out and do a few of the suggested self ID checks. https://www.google.com/search?q=met...0j69i57j0l4.6607j0j7&sourceid=chrome&ie=UTF-8. Some one at Montana Tech could probably help you if you can find one who is willing. If they have a geology or mineral museum the curator may guide you to the right person.

Good luck.

 

[Jenglass]

What about this is it agate?