Identify This Rock!

[crjmurray]

I found a rock...
View attachment 172333

Rock
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Can somebody explain why this rock looks this way? Frankly, I find it suspicious. And to keep this relevant to the C&E section, I'd like the young earthers to take a go at this as well.

 

[Murby]

ceramic tiles on rock or concrete? How about a photo from the side showing the layers

 

[crjmurray]

ceramic tiles on rock or concrete? How about a photo from the side showing the layers

I wondered how quick that would be asked. Hold on, I'll have to go find it again.....

 

[crjmurray]

Found it!

 

[Murby]

That's the back.. show the sides

 

[crjmurray]

That's the back.. show the sides

That is a side. Your rock identifying capabilities are now suspect.....

 

[florida2]

I have virtually no geological knowledge, but that is a seriously cool rock.

 

[Subduction Zone]

My best guess is that it is some sort of fractured granitic rock with quartz veins filling the fracture lines. Hard to say without the actual rock in my hand.

 

[crjmurray]

I have virtually no geological knowledge, but that is a seriously cool rock.

Yes florida, yes it is.

 

[crjmurray]

My best guess is that it is some sort of fractured granitic rock with quartz veins filling the fracture lines. Hard to say without the actual rock in my hand.

They are quartz veins but other than that I have no idea about it. I don't know how that stuff forms either.

 

[Murby]

That is a side. Your rock identifying capabilities are now suspect.....

You showed the front and the back. Take a photo of the edges..

 

[crjmurray]

You showed the front and the back. Take a photo of the edges..

That was a photo of the edge. Your rock identifying skills are now seen as amateurish and any conclusions you may draw will be considered as inconclusive.

 

[Murby]

That was a photo of the edge. Your rock identifying skills are now seen as amateurish and any conclusions you may draw will be considered as inconclusive.

Ok.. I'll give it a shot..
I see quartz..
Rock came from an underground mine.. The grid pattern lays out the explosives.

 

[Subduction Zone]

They are quartz veins but other than that I have no idea about it. I don't know how that stuff forms either.

Fractures can be parallel or at angles as seen in your sample. An outcrop rather than a single rock would tell you more. But it could be just a large cobble in some glacial moraine. On a fresh surface how big are the crystals? Can you see clear glassy looking ones? How about one that seems to form sheets? That is hard to see on just crystals, but if there is some mica in there on a fresh surface it will still look layered at times.

 

[Murby]

Your rock identifying skills are now seen as amateurish

Amateurish? Wow... I feel flattered that you would rate my geology skills so high..

 

[Subduction Zone]

Ok.. I'll give it a shot..
I see quartz..
Rock came from an underground mine.. The grid pattern lays out the explosives.

I don't think that you would get quartz deposition that quickly.

 

[Murby]

I don't think that you would get quartz deposition that quickly.

Huh?
Quartz veins are found in underground mines all the time...

I'm guessing that rock was blasted out of a larger rock.. there's either a mine nearby or maybe a bridge over a river or some other structure was built into a rock face and they used explosives to shape and remove what they needed.

 

[Subduction Zone]

Huh?
Quartz veins are found in underground mines all the time...

I'm guessing that rock was blasted out of a larger rock.. there's either a mine nearby or maybe a bridge over a river or some other structure was built into a rock face and they used explosives to shape and remove what they needed.

Yes, but they are not due to recent blasting. In fact they are usually associated with an orogenic event. Or in other words, when the mountains were made water underneath heat and pressure dissolved gold out of some areas and redeposited it in quartz veins. The orogenic event was millions of years ago.

 

[Murby]

Yes, but they are not due to recent blasting. In fact they are usually associated with an orogenic event. Or in other words, when the mountains were made water underneath heat and pressure dissolved gold out of some areas and redeposited it in quartz veins. The orogenic event was millions of years ago.

You sound like you know a lot more than I do about this stuff.. But I don't understand your point as it pertains to my guess that the rock came from some kind of mining operation or construction job. Those grid lines on the face of the rock look like stuff they lay out when using explosives.

 

[crjmurray]

Fractures can be parallel or at angles as seen in your sample. An outcrop rather than a single rock would tell you more. But it could be just a large cobble in some glacial moraine. On a fresh surface how big are the crystals? Can you see clear glassy looking ones? How about one that seems to form sheets? That is hard to see on just crystals, but if there is some mica in there on a fresh surface it will still look layered at times.

You're my rock guy SZ. What do you mean on a fresh surface? There are no clear glassy pieces on this rock. I can post some more pics of the rock. Finding where the rock came from will take leg work.