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Author Topic: What type of rock is this?  (Read 5926 times)

tuto99

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What type of rock is this?
« on: February 14, 2013, 01:54:10 PM »
I found a decently large rock in my backyard today, and I was wondering what type it is.
This rock is mostly porous, even though you can't notice them from afar with the exception of a few larger ones.
It is light-grey in color, like a dirty sock type of grey. It has no definite sort of pattern on the surface, and it contains no fossils. The most interesting and important thing is that this rock is covered with these white chunks of rock, and they are embedded on and inside the rock. Kind of like chalk.
Does anyone have any ideas on what it coud be? Thanks.

atomic7732

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Re: What type of rock is this?
« Reply #1 on: February 14, 2013, 02:29:06 PM »
Pic(s)?

tuto99

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Re: What type of rock is this?
« Reply #2 on: February 14, 2013, 02:56:30 PM »
Sure.
I initially had a larger rock, and the chunks covered more of the surface. I just broke it into smaller pieces.
And the rock looks darker because it was in the rain.

Hellpotatoe

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Re: What type of rock is this?
« Reply #3 on: February 14, 2013, 03:35:52 PM »
Looks like sumthing covered in cement, kol

atomic7732

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Re: What type of rock is this?
« Reply #4 on: February 14, 2013, 03:49:41 PM »
Do you by any chance have a macro function on your camera... it would help a ton with the blurriness.

From the looks of it the white rocks inside it are probably milky quartz

Hellpotatoe

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Re: What type of rock is this?
« Reply #5 on: February 14, 2013, 04:07:48 PM »
Do you by any chance have a macro function on your camera... it would help a ton with the blurriness.

From the looks of it the white rocks inside it are probably milky quartz
Hm, I have pink quartz..

tuto99

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Re: What type of rock is this?
« Reply #6 on: February 14, 2013, 04:26:29 PM »
Do you by any chance have a macro function on your camera... it would help a ton with the blurriness.

From the looks of it the white rocks inside it are probably milky quartz
Sorry for the bad quality. once again, I used my cheap camcorder for this.
But i don't think a "macro function" on my camera. I'll check and see though.

blotz

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Re: What type of rock is this?
« Reply #7 on: February 14, 2013, 04:48:00 PM »
just like focus it by..
wait, a recorder or a camera?

tuto99

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Re: What type of rock is this?
« Reply #8 on: February 14, 2013, 05:05:06 PM »
just like focus it by..
wait, a recorder or a camera?
Camcorder, excuse me.

smjjames

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Re: What type of rock is this?
« Reply #9 on: February 14, 2013, 05:12:26 PM »
Well, I'd say its some kind of sedimentary rock, possibly shale?

Actually, no, whirl the color is similar, the inclusions are too big, I think. I am pretty sure it's a sedimentary rock, considering he is in Florida.

tuto99

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Re: What type of rock is this?
« Reply #10 on: February 14, 2013, 05:15:18 PM »
Well, I'd say its some kind of sedimentary rock, possibly shale?
I think shale rocks are smoother than what I found.

smjjames

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Re: What type of rock is this?
« Reply #11 on: February 14, 2013, 05:17:47 PM »
Well, I'd say its some kind of sedimentary rock, possibly shale?
I think shale rocks are smoother than what I found.

Yeah, I was going by the color, and yes shale would be smoother.

Was it like partially in the ground or like what?

tuto99

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Re: What type of rock is this?
« Reply #12 on: February 14, 2013, 05:20:13 PM »
Well, I'd say its some kind of sedimentary rock, possibly shale?
I think shale rocks are smoother than what I found.

Yeah, I was going by the color, and yes shale would be smoother.

Was it like partially in the ground or like what?
Oh, ok.
When I found the rock, it was fully exposed, and it was next to my house.

smjjames

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Re: What type of rock is this?
« Reply #13 on: February 14, 2013, 05:24:05 PM »
You'd have to look up about the geology local to your area to see what type of sedimentary rock it is.

 
Well, I'd say its some kind of sedimentary rock, possibly shale?
I think shale rocks are smoother than what I found.

Yeah, I was going by the color, and yes shale would be smoother.

Was it like partially in the ground or like what?
Oh, ok.
When I found the rock, it was fully exposed, and it was next to my house.

Oh.  Were there other similar types of rocks nearby?

tuto99

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Re: What type of rock is this?
« Reply #14 on: February 14, 2013, 05:28:07 PM »
You'd have to look up about the geology local to your area to see what type of sedimentary rock it is.

 
Well, I'd say its some kind of sedimentary rock, possibly shale?
I think shale rocks are smoother than what I found.

Yeah, I was going by the color, and yes shale would be smoother.

Was it like partially in the ground or like what?
Oh, ok.
When I found the rock, it was fully exposed, and it was next to my house.

Oh.  Were there other similar types of rocks nearby?
The only other rock I found was limestone, I think. It was lighter in color and was more brittle, since I easily broke it in half with a hammer.

Tass

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Re: What type of rock is this?
« Reply #15 on: February 15, 2013, 03:00:14 AM »
The rock looks like pumice (the pictures on wikipedia are light colored, but pumice is often black too).

The porosity would be due to gas bubbling out of the lave that formed it. The inclusion of other rock could have happened by breaking of from the edges of the magma chamber.   

blotz

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Re: What type of rock is this?
« Reply #16 on: February 15, 2013, 06:55:04 PM »
i thought pumice had holes and always floated.
what'ev

Tass

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Re: What type of rock is this?
« Reply #17 on: February 16, 2013, 03:58:45 AM »
i thought pumice had holes and always floated.
what'ev

Pumice is porous yes. It is basically a stone foam. He said it is porous, it is hard to tell from the blurred pictures how much.

Pumice often floats because of the trapped air, but not always.

tuto99

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Re: What type of rock is this?
« Reply #18 on: February 17, 2013, 04:32:40 PM »
i thought pumice had holes and always floated.
what'ev

Pumice is porous yes. It is basically a stone foam. He said it is porous, it is hard to tell from the blurred pictures how much.

Pumice often floats because of the trapped air, but not always.
Yeah, the rock is quite porous.
I searched up pumice and I didn't see any white chunks of rock in any of the images I saw.
Could've my rock just trap the white rocks or something?

Omnigeek6

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Re: What type of rock is this?
« Reply #19 on: February 17, 2013, 07:08:57 PM »
This looks like it might be breccia

but you should really share more information on what kind of place your yard is in.

tuto99

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Re: What type of rock is this?
« Reply #20 on: February 17, 2013, 07:27:44 PM »
This looks like it might be breccia

but you should really share more information on what kind of place your yard is in.
Oh okay.
Where I live is mostly marshland, and the town I live in is surrounded by lakes and shallow ponds. Look up "Saint Cloud, FL" on Google Maps, and you'll see. But otherwise I guess I live on dry land.