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# Diamonds are almost impos- sible to detect directly

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VP
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Diamonds are almost impos- sible to detect directly [#permalink]

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28 Jan 2005, 06:06
Diamonds are almost impos-
sible to detect directly because they
are so rare: very rich kimberlite
Line pipes, the routes through which
(5) diamonds rise, may contain only
three carats of diamonds per ton
of kimberlite. Kimberlite begins as
magma in Earthâ€™s mantle (the layer
between the crust and the core). As
(10) the magma smashes through layers
of rock, it rips out debris, creating
a mix of liquid and solid material.
Some of the solid material it brings
up may come from a so-called
(15) diamond-stability field, where condi-
tions of pressure and temperature
are conducive to the formation of
diamonds. If diamonds are to sur-
vive, though, they must shoot toward
(20) Earthâ€™s surface quickly. Otherwise,
they revert to graphite or burn.
Explorers seeking diamonds look
for specks of â€œindicator mineralsâ€
If you have any questions
New!
VP
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28 Jan 2005, 06:07

OA will be given later.
Manager
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28 Jan 2005, 08:46
1d
2e
3c ( a also looks probable to me)
4b
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28 Jan 2005, 19:50
1-b
2-e
3-e
4-c
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Paul

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01 Feb 2005, 07:43
Anybody wants to try this one?
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Paul

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01 Feb 2005, 08:18
1 - D

2 - A

3 - C

4 - C
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01 Feb 2005, 09:13
EACC
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01 Feb 2005, 09:23
1
KUDOS
(1)The primary purpose of the passage is to
A. discuss an objection to Gurneyâ€™s theories about the uses of indicator minerals
Definitely not
B. explore the formation of diamonds and the reasons for their scarcity
yes, but not the main purpose
C. analyze the importance of kimberlite pipes in the formation of diamonds
Again not the main purpose
D. define the characteristics of indicator minerals under differing conditions
Yes he did that, but still it's not the purpose
E. explain a method of determining whether kimberlite pipes are likely to contain diamonds
Yes

(2)Each of the following is mentioned in the passage as a difference between G10 garnet and other versions of garnet EXCEPT

A. level of oxidation
This is mentioned for the ilmenites, instead of the garnet
B. commonness of occurrence
C. chemical signature
D. place of formation
E. appearance in conjunction with diamonds

(3)
The passage suggests that the presence of G10 garnet in a kimberlite pipe indicates that

A. the pipe in which the garnet is found has a 90% chance of containing diamonds
No number is mentioned
B. the levels of calcium and chrome in the pipe are conducive to diamond formation
C. the pipe passed through a diamond-stability field and thus may contain diamonds
D. any diamonds the pipe contains would not have come from the diamond-stability field
Definitely out
E. the pipeâ€™s temperature was so high that it oxidized any diamonds the pipe might have contained
oxidization is not mentioned when talk about garnet

(4)
According to the passage, Gurney refined the use of ilmenites in prospecting for diamonds in which of the following ways?

A. He found that ilmenites are brought up from the mantle by kimberlite pipes and erode out into the surrounding land in greater quantities than diamonds.
Not helping
B. He found that since ilmenites do not form in the diamond-stability field, their presence indicates the absence of diamonds.
Not all ilmenites, but the ones with highly oxidized iron
C. He showed that highly oxidized iron content in ilmenites indicates a low survival rate for diamonds.
Thus this one is correct
D. He found that when the iron in ilmenites is highly oxidized, conditions in the magma were probably conducive to the formation of diamonds.
It's the opposite
E. He showed that ilmenites take on more or less oxygen in the kimberlite pipe depending on the concentration of diamonds.
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01 Feb 2005, 10:19
Thanks all , here is the OA

1, E

2, A

3, C

4, C

Congratulations, HongHu, it seems like you're ready for the test.
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01 Feb 2005, 10:24
Thank you! I haven't even prepared anything for RC and CR. Was counting on my basic skills.
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01 Feb 2005, 10:25
Hmmm, we have very differing answers here. This is one of those dreaded science passages The reason I took 1-B is because of the very first sentence which describes the tone of the passage.
Quote:
Diamonds are almost impos-
sible to detect directly because they
are so rare

One can spend years
Quote:
(30) searching for indicators and tracing
them back to the pipes that are their
source; however, 90 percent of
kimberlite pipes found this way are
barren of diamonds, and the rest
(35) are usually too sparse to mine

To me, (D) and (E) are more representative of the second half of the passage. Overall, we are talking about the scarcity of diamonds.

Chunjuwu, were there paragraphs in this passage? It would be good if they were separated into paragraphs accordingly.
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Paul

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01 Feb 2005, 10:28
Thanks Paul.

Now I have is only pdf file.

If I have, I will share with you.
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01 Feb 2005, 10:29
wow, good job honghu, just realized I took too much time to go over the question before the answer got posted. Well, I am dumbfounded
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Paul

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01 Feb 2005, 10:34
But your grammar skills still PWNs everyone of us. (Yes you can see that I've been wandering around teh internet. ) And I can hardly get about half of the grammar questions right. So there. And we share our best tricks so we can collectively PWN the GMAT.
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01 Feb 2005, 11:01
Yup, I think RC was/is my downfall. If I take the GMAT again, I will know what to really focus on
_________________

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Paul

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01 Feb 2005, 11:57
710 speaks for itself.
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01 Feb 2005, 12:03
HongHu wrote:
(1)The primary purpose of the passage is to
A. discuss an objection to Gurneyâ€™s theories about the uses of indicator minerals
Definitely not
B. explore the formation of diamonds and the reasons for their scarcity
yes, but not the main purpose
C. analyze the importance of kimberlite pipes in the formation of diamonds
Again not the main purpose
D. define the characteristics of indicator minerals under differing conditions
Yes he did that, but still it's not the purpose
E. explain a method of determining whether kimberlite pipes are likely to contain diamonds
Yes

(2)Each of the following is mentioned in the passage as a difference between G10 garnet and other versions of garnet EXCEPT

A. level of oxidation
This is mentioned for the ilmenites, instead of the garnet
B. commonness of occurrence
C. chemical signature
D. place of formation
E. appearance in conjunction with diamonds

(3)
The passage suggests that the presence of G10 garnet in a kimberlite pipe indicates that

A. the pipe in which the garnet is found has a 90% chance of containing diamonds
No number is mentioned
B. the levels of calcium and chrome in the pipe are conducive to diamond formation
C. the pipe passed through a diamond-stability field and thus may contain diamonds
D. any diamonds the pipe contains would not have come from the diamond-stability field
Definitely out
E. the pipeâ€™s temperature was so high that it oxidized any diamonds the pipe might have contained
oxidization is not mentioned when talk about garnet

(4)
According to the passage, Gurney refined the use of ilmenites in prospecting for diamonds in which of the following ways?

A. He found that ilmenites are brought up from the mantle by kimberlite pipes and erode out into the surrounding land in greater quantities than diamonds.
Not helping
B. He found that since ilmenites do not form in the diamond-stability field, their presence indicates the absence of diamonds.
Not all ilmenites, but the ones with highly oxidized iron
C. He showed that highly oxidized iron content in ilmenites indicates a low survival rate for diamonds.
Thus this one is correct
D. He found that when the iron in ilmenites is highly oxidized, conditions in the magma were probably conducive to the formation of diamonds.
It's the opposite
E. He showed that ilmenites take on more or less oxygen in the kimberlite pipe depending on the concentration of diamonds.

I got C, E, C, C......Honghu, for ques 2 where in the passage "E" is mentioned abt differences in garnet ??

Also for ques 1....seems like only latter half of the passage mentions a method of determining whether kimberlite pipes are likely to contain diamonds.....I am not convinced that this is the main idea of the passage. Doesn't seem like author set out to write this passage to mention a method only, thoughts ?.....
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01 Feb 2005, 12:20
banerjeea_98 wrote:
I got C, E, C, C......Honghu, for ques 2 where in the passage "E" is mentioned abt differences in garnet ??

"G10 garnets, a type of garnet typically found in diamond-rich pipes"
Meaning garnets appear in conjunction with diamonds.

Quote:
Also for ques 1....seems like only latter half of the passage mentions a method of determining whether kimberlite pipes are likely to contain diamonds.....I am not convinced that this is the main idea of the passage. Doesn't seem like author set out to write this passage to mention a method only, thoughts ?.....

Hmm I don't know how to talk about this. Basically we can shorten the paragraph like this:

Diamonds are very important. Because of the way they are formed we can use some other things to locate diamonds. But it is still hard to locate them. This person, however, discovered a couple neat ways so that it isn't so hard to find diamonds now.

So what is the purpose of this paragraph? It talks about diamonds, yes, but not everything about diamond. It's about how to find them. And more specifically, the method that makes it easy to find them.
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01 Feb 2005, 12:32
HongHu wrote:
banerjeea_98 wrote:
I got C, E, C, C......Honghu, for ques 2 where in the passage "E" is mentioned abt differences in garnet ??

"G10 garnets, a type of garnet typically found in diamond-rich pipes"
Meaning garnets appear in conjunction with diamonds.

Quote:
Also for ques 1....seems like only latter half of the passage mentions a method of determining whether kimberlite pipes are likely to contain diamonds.....I am not convinced that this is the main idea of the passage. Doesn't seem like author set out to write this passage to mention a method only, thoughts ?.....

Hmm I don't know how to talk about this. Basically we can shorten the paragraph like this:

Diamonds are very important. Because of the way they are formed we can use some other things to locate diamonds. But it is still hard to locate them. This person, however, discovered a couple neat ways so that it isn't so hard to find diamonds now.

So what is the purpose of this paragraph? It talks about diamonds, yes, but not everything about diamond. It's about how to find them. And more specifically, the method that makes it easy to find them.

I see why I was wrong in ques 2...I thot "appearance in conjunction of diamond" meant garnets that have a look and feel of diamonds....didn't understand the sentence atall. But I am still not convinced that the main idea is to explain one method to find diamonds
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Re: Diamonds are almost impos- sible to detect directly [#permalink]

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23 Jul 2015, 17:03
chunjuwu wrote:
Diamonds are almost impos-
sible to detect directly because they
are so rare: very rich kimberlite
Line pipes, the routes through which
(5) diamonds rise, may contain only
three carats of diamonds per ton
of kimberlite. Kimberlite begins as
magma in Earthâ€™s mantle (the layer
between the crust and the core). As
(10) the magma smashes through layers
of rock, it rips out debris, creating
a mix of liquid and solid material.
Some of the solid material it brings
up may come from a so-called
(15) diamond-stability field, where condi-
tions of pressure and temperature
are conducive to the formation of
diamonds. If diamonds are to sur-
vive, though, they must shoot toward
(20) Earthâ€™s surface quickly. Otherwise,
they revert to graphite or burn.
Explorers seeking diamonds look
for specks of â€œindicator mineralsâ€

why do ppl post such passages without questions?
Re: Diamonds are almost impos- sible to detect directly   [#permalink] 23 Jul 2015, 17:03

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