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Author Topic:   Introduction To Geology quiz
PurpleYouko
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Posts: 713
From: Columbia Missouri
Joined: 11-11-2004


Message 16 of 29 (702569)
07-09-2013 1:46 PM


9. Granites are coarse-grained and light in color.

I answered False to this on the grounds that the granite counter tops in my kitchen are about as dark as it is possible to get. (i.e. jet black.)

My answer was marked as incorrect.

Stopped doing the tests after that. What's the point when some of their answers are just plain wrong?


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Minnemooseus
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Posts: 3459
From: Duluth, Minnesota, U.S. (West end of Lake Superior)
Joined: 11-11-2001
Member Rating: 3.5


Message 17 of 29 (702581)
07-09-2013 9:39 PM
Reply to: Message 16 by PurpleYouko
07-09-2013 1:46 PM


Black "granite"
... the granite counter tops in my kitchen are about as dark as it is possible to get. (i.e. jet black.)

I'm guessing there's an implied smiley in there, but if not I'll say "The manufacturer/seller/namer of your "granite" was using the term extremely loosely." I wonder if the material is even natural rock.

Moose


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New Cat's Eye
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Posts: 11109
From: near St. Louis
Joined: 01-27-2005
Member Rating: 1.8


Message 18 of 29 (702628)
07-10-2013 11:33 AM
Reply to: Message 17 by Minnemooseus
07-09-2013 9:39 PM


Re: Black "granite"
... the granite counter tops in my kitchen are about as dark as it is possible to get. (i.e. jet black.)

I'm guessing there's an implied smiley in there, but if not I'll say "The manufacturer/seller/namer of your "granite" was using the term extremely loosely." I wonder if the material is even natural rock.

Here's the wiki picture of "Various granites":


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New Cat's Eye
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Posts: 11109
From: near St. Louis
Joined: 01-27-2005
Member Rating: 1.8


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Message 19 of 29 (702629)
07-10-2013 11:35 AM
Reply to: Message 16 by PurpleYouko
07-09-2013 1:46 PM


9. Granites are coarse-grained and light in color.
I answered False to this on the grounds that the granite counter tops in my kitchen are about as dark as it is possible to get. (i.e. jet black.)

Some granites are light in color. Just because some others are dark doesn't make that a false statement.

Apples are red.

The existence of green apples doesn't make that statement false.


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PurpleYouko
Member
Posts: 713
From: Columbia Missouri
Joined: 11-11-2004


Message 20 of 29 (702665)
07-10-2013 4:53 PM
Reply to: Message 19 by New Cat's Eye
07-10-2013 11:35 AM


Apples are red.

The existence of green apples doesn't make that statement false.


Actually I beg to differ on that.
The statement "Apples are red" implies ALL apples are red.
If you wanted to say that some apples are not red then you would need to include the word some into your statement otherwise the existence of green apples does make the statement false.
Or at the very least completely meaningless.
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New Cat's Eye
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Posts: 11109
From: near St. Louis
Joined: 01-27-2005
Member Rating: 1.8


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Message 21 of 29 (702667)
07-10-2013 5:05 PM
Reply to: Message 20 by PurpleYouko
07-10-2013 4:53 PM


Actually I beg to differ on that.
The statement "Apples are red" implies ALL apples are red.
If you wanted to say that some apples are not red then you would need to include the word some into your statement otherwise the existence of green apples does make the statement false.

Nah, I don't think the all is implied. If you wanted to say that, then you'd need to include the all as: All apples are red.

I mean, cars are red. Cars are white. Cars are black. None of those statements are false.

As it sits, if you claim the statement "apples are red" is false, then what you are saying is that apples are not red, and that's just wrong, cause some of them are.

Or at the very least completely meaningless.

Not meaningless... ambiguous.


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Dr Adequate
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Joined: 07-20-2006
Member Rating: 3.3


(1)
Message 22 of 29 (702671)
07-10-2013 6:12 PM
Reply to: Message 18 by New Cat's Eye
07-10-2013 11:33 AM


Re: Black "granite"
Here's the wiki picture of "Various granites":

Yes, but they aren't all granite in the geological sense. People who sell cut and polished rocks call anything "granite" if it's an intrusive igneous rock, and therefore has that pleasant speckled pattern. As the WP article notes: "In building and for countertops, the term "granite" is often applied to all igneous rocks with large crystals, and not specifically to those with a granitic composition." But black "granite" isn't granite. It's gabbro or diorite or something. So for example this trade website calls this stone "granite":

Specifically, it calls it "diorite black granite", which to a geologist is simply an oxymoron: if it's diorite (which it is) then it's not granite (which it isn't). Note that it looks just like the leftmost of the "various granites" in your picture, which is also really diorite.

Edited by Dr Adequate, : No reason given.


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Pressie
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Posts: 1453
From: Pretoria, SA
Joined: 06-18-2010
Member Rating: 2.0


Message 23 of 29 (702705)
07-11-2013 12:05 AM
Reply to: Message 22 by Dr Adequate
07-10-2013 6:12 PM


Re: Black "granite"
My sister-in-law bought 'pink granite' table tops for her kitchen; or that's how those were advertised and displayed in the showroom.

When the company turned up to install those table tops, those rocks turned out to be dark pink-light red syenites with the most beautiful orthoclase crystals. Stunning 'granite'-syenites!


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New Cat's Eye
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Posts: 11109
From: near St. Louis
Joined: 01-27-2005
Member Rating: 1.8


Message 24 of 29 (702744)
07-11-2013 10:33 AM
Reply to: Message 22 by Dr Adequate
07-10-2013 6:12 PM


Re: Black "granite"
It seems like splitting hairs to me (granted this is about a Geology quiz so its warranted)

Is it just the particular mineral compositions that make one intrusive igneous rock deserving of the name, but another intrusive igneous rock not?


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ringo
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Posts: 12725
From: frozen wasteland
Joined: 03-23-2005
Member Rating: 2.0


Message 25 of 29 (702805)
07-11-2013 12:37 PM
Reply to: Message 22 by Dr Adequate
07-10-2013 6:12 PM


Re: Black "granite"
Dr Adequate writes:

But black "granite" isn't granite. It's gabbro or diorite or something.


If George advertises gabbro countertops and Jim advertises diorite countertops, who goes out of business first?
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New Cat's Eye
Member
Posts: 11109
From: near St. Louis
Joined: 01-27-2005
Member Rating: 1.8


Message 26 of 29 (702820)
07-11-2013 1:54 PM
Reply to: Message 25 by ringo
07-11-2013 12:37 PM


Re: Black "granite"
Dr Adequate writes:

But black "granite" isn't granite. It's gabbro or diorite or something.


If George advertises gabbro countertops and Jim advertises diorite countertops, who goes out of business first?

George, because gabbro sounds silly and diorite at least sounds like rock.


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Dr Adequate
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Posts: 15376
Joined: 07-20-2006
Member Rating: 3.3


Message 27 of 29 (702858)
07-11-2013 9:54 PM
Reply to: Message 24 by New Cat's Eye
07-11-2013 10:33 AM


Re: Black "granite"
It seems like splitting hairs to me (granted this is about a Geology quiz so its warranted)

Is it just the particular mineral compositions that make one intrusive igneous rock deserving of the name, but another intrusive igneous rock not?

Odd use of the word "just". How would you like to classify intrusive igneous rocks except by what they're made of? They don't really have any other qualities, do they?


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New Cat's Eye
Member
Posts: 11109
From: near St. Louis
Joined: 01-27-2005
Member Rating: 1.8


Message 28 of 29 (702885)
07-12-2013 10:46 AM
Reply to: Message 27 by Dr Adequate
07-11-2013 9:54 PM


Re: Black "granite"
It seems like splitting hairs to me (granted this is about a Geology quiz so its warranted)
Is it just the particular mineral compositions that make one intrusive igneous rock deserving of the name, but another intrusive igneous rock not?

Odd use of the word "just". How would you like to classify intrusive igneous rocks except by what they're made of?

I was asking out of ignorance to see if there was anything more to it than that. For example, when classifying metals you can have two differnt types of steel even though they have the same composition. Martensite is quenched austenite which results in a different crystalline structure of the same composition. For polymers, HDPE is still just polyethylene but its heavily cross linked and has a much higher density. So you could use properties of the material in addition to its composition.

They don't really have any other qualities, do they?

Density... hardness... crystalline structure... melting temp... Color... Aesthetics... usefulness as a counter-top. I didn't know if any other things were taken into account or not.

Apparently the answer is "no".


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Dr Adequate
Member
Posts: 15376
Joined: 07-20-2006
Member Rating: 3.3


Message 29 of 29 (702936)
07-12-2013 9:06 PM
Reply to: Message 28 by New Cat's Eye
07-12-2013 10:46 AM


Re: Black "granite"
Martensite is quenched austenite which results in a different crystalline structure of the same composition.

But you notice how they have two different names? The same is true of naturally occurring minerals, e.g. aragonite is orthorhombic calcium carbonate and calcite is trigonal calcium carbonate. So when you name a mineral, you do specify its crystal system and so all its other material properties.

So things like density, hardness, melting point, viscosity when molten, crystal structure, etc are either properties of the individual minerals in the rock, or a consequence of their properties; so once you've said what minerals the rock is made of, you have in fact said nearly everything about it.


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