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Author | Topic: Introduction To Geology quiz | ||||||||||||||||||||||||||||||||||||||||||||||||
PurpleYouko Member Posts: 714 From: Columbia Missouri Joined: |
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 Member Posts: 3945 From: Duluth, Minnesota, U.S. (West end of Lake Superior) Joined: Member Rating: 10.0 |
... 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 Inactive Member |
... 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 Inactive Member
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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: 714 From: Columbia Missouri Joined: |
Apples are red.
Actually I beg to differ on that. The existence of green apples doesn't make that statement false.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 Inactive Member
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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 Member (Idle past 306 days) Posts: 16113 Joined:
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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 Member Posts: 2103 From: Pretoria, SA Joined: |
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 Inactive Member |
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 Member (Idle past 434 days) Posts: 20940 From: frozen wasteland Joined: |
Dr Adequate writes:
If George advertises gabbro countertops and Jim advertises diorite countertops, who goes out of business first?
But black "granite" isn't granite. It's gabbro or diorite or something.
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New Cat's Eye Inactive Member |
Dr Adequate writes:
If George advertises gabbro countertops and Jim advertises diorite countertops, who goes out of business first? But black "granite" isn't granite. It's gabbro or diorite or something. George, because gabbro sounds silly and diorite at least sounds like rock.
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Dr Adequate Member (Idle past 306 days) Posts: 16113 Joined: |
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 Inactive Member |
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 (Idle past 306 days) Posts: 16113 Joined: |
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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