EOSC 118 Study Guide - Quiz Guide: Volcanic Pipe, Kimberlite, Culet
14 Jun 2018
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Quiz #2- Person 1
1. What crystal system does diamond belong to?
Isometric
2. The round brilliant cut was designed to…
Return as much possible light back through the table
3. Diamonds are capable of being carried to the surface of the earth by kimberlite
and lamproite magmas because…
Magma ascends to the surface very quickly
4. All kimberlite do not contain diamonds.
5. Which of the following parts of a cut diamond is not always present on a modern
cut diamond?
Culet
6. The classic shape of a kimberlite pipe is similar to a…
Carrot
7. An IF D diamond is more valuable than a S1 D stone if they have the same carat
weight.
8. The P-T stability field for diamond is sometimes called…
The Diamond Window
9. What gem does the term “gota de aceite” refer to?
Emerald (“butterfly wing effect”)
10. Which of the following provinces/territories does not have emerald occrences?
Nunavut; Places w/ occurrences: Yukon, NWT, Ontario, BC
11. A 15 carat unheated aquamarine from Brazil would be…
A good size
12. The following gems can be produced synthetically…
Ruby, emerald, diamond
13. An example of a mineral that is cyclosilicate…
Beryl; has ring structure of SiO4 tetrahedra
14. Emeralds occur in…
Pegmatite; metamorphosed schist; alluvial deposits
find more resources at oneclass.com
find more resources at oneclass.com
15. The “Black Prince’s Ruby” is actually…
Spinel
16. What is the hardness of ruby and sapphire?
Hardness of 9
17. Which provinces/territories do not have corundum occurrences?
Yukon; Places w/ occurrences: BC, Montana, Ontario, Nunavut
18. What colour does the term “Kashmir” refer to for corundum?
Vivid velvety blue
19. What is the common form of euhedral corundum crystals?
“Barrel” shaped tapering hexagonal prism
20. Historically, where were the most valuable rubies mined?
Burma
Quiz #2- Person 2
1. Where do some of the earliest diamonds original from?
India
2. Which of the following is true for diamond clarity grading?
VS2 > I1
3. Which of the following rocks are capable of hosting diamonds?
Kimberlite
4. What is the Mohs hardness of diamond?
Hardness of 10
5. If the density of diamond is 3.51 g/cm3 and the density of graphite is 2.20 g/cm2,
what does this say about the crystal structure of the 2 minerals if their composition
is the same?
The atoms in diamond are packed closer together than in graphite
6. Ideally, what elements comprise a diamond?
Carbon
7. The Argyle mine in Australia is unique because it produces…
Pink-red and purple diamonds
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find more resources at oneclass.com
8. Diamond-bearing kimberlites intrude into cratons, which are…
Greater than 2.5 billion years old
9. The gemstone varieties emerald and aquamarine are part of which mineral group?
Beryl
10. What are some common treatments for beryl?
Oiling, heat treatment
11. Emerald is rarer than aquamarine because…
Chromium and beryllium do not commonly exist in the same geological environment
12. The presence of Fe2+ in emerald and ruby has effect on the red and green colours
of those minerals.
13. Which country produces significant amounts of commercial emerald?
Brazil
14. Why are “star” corundum gems typically larger (more carats) than faceted stones?
“Star” stones do not need to be transparent to show their beauty
Quiz #2- Person 3
1. The “fire” in diamond is caused by?
Dispersion
2. What are the 4C’s of diamond grading?
Cut, clarity, colour, carat
3. Which is most important distinguishing property of diamonds?
Thermal conductivity
4. Diamond has the following crystal symmetry:
Cubic
5. Which of the following minerals can scratch diamonds?
Diamond
6. Which of the following best describes diamond’s chemical formula?
Carbon polymorph
7. Which of the following best describes beryl’s chemical formula?
Beryllium aluminosilicate
find more resources at oneclass.com
find more resources at oneclass.com
Document Summary
Isometric: the round brilliant cut was designed to . Return as much possible light back through the table: diamonds are capable of being carried to the surface of the earth by kimberlite and lamproite magmas because . Culet: the classic shape of a kimberlite pipe is similar to a . Carrot: an if d diamond is more valuable than a s1 d stone if they have the same carat weight, the p-t stability field for diamond is sometimes called . Nunavut; places w/ occurrences: yukon, nwt, ontario, bc: a 15 carat unheated aquamarine from brazil would be . A good size: the following gems can be produced synthetically . Ruby, emerald, diamond: an example of a mineral that is cyclosilicate . Beryl; has ring structure of sio4 tetrahedra: emeralds occur in . Pegmatite; metamorphosed schist; alluvial deposits: the black prince"s ruby is actually . Carbon: the argyle mine in australia is unique because it produces .
