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Unformatted text preview: 2016/11/26 Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Review Test Submission: Quiz 3 — 2016WA-EOSC118—... 1 out of1 points What is the hardness of ruby and sapphire? Selected Answer: 0 e. 9 Correct Answer: 5 e. 9 1 out of1 points Asterism in corundum is: Selected o a. Answer: an optical phenomenon resulting in 6 or 12 pointed star reflectance, caused by inclusion of rutile needles Correct a a. Answer: an optical phenomenon resulting in 6 or 12 pointed star reflectance, caused by inclusion of rutile needles 1 out of1 points Which of the provinces and states listed below does NOT (yet) have corundum occurrences? Selected a e. Answer: The statement is false, each of the listed locations have corundum occurrences. Correct Answer: a e. The statement is false, each of the listed locations have corundum occurrences. 1 out of1 points Which of the following is not a variety of gem corundum? Selected Answer: 0 c. Alexandrite. Correct Answer: 0 c. Alexandrite. 1 out of1 points Ruby with the finest optical qualities are rarely greater than: Selected Answer: *6 b. 2 carats Correct Answer: {5 b. 2 carats 1 out of1 points A ruby of the same quality and size of a sapphire is: Selected Answer: 0 d. More expensive and more rare Correct Answer: 0 d. More expensive and more rare https://connect.ubc.ca/webapps/assessment/review/review.jsp?attempt_id=_55291104_1&course_id=_92195_1&content_id=_3625663_1&outcome_id... 1/4 2016/11/26 Question 7 Question 8 Question 9 Question 10 Question 11 Question 12 Review Test Submission: Quiz 3 — 2016WA-EOSC118—... . . 0 out of 1 oints True or False: Carbonate minerals, such as caICIte, never fluoresce. p Selected Answer: a True Correct Answer: a False 0.5 out of 1 points Why are immersion cells (or vessels) a useful tool for gemologists? (Check all that apply; wrong answers will be penalized) Selected Answers: a a. They can be used to determine the refractive index of a gemstone 0 b. They can more clearly show large inclusions contained in gemstones a c. They can be used to help inspect a gemstone for diffusion treatments {I} d. They can help show if a gemstone is a composite stone (doublet or triplet) a e. They can be used to help determine if a gemstone is synthetic or natural Correct Answers: a a. They can be used to determine the refractive index of a gemstone O 0. They can be used to help inspect a gemstone for diffusion treatments a d. They can help show if a gemstone is a composite stone (doublet or triplet) 0 out of 1 points Mineralogical and textural zonation of pegmatite bodies Selected D c_ is an indication that these rocks represent chemical and textural equilibrium. Answer: Correct a b. Answer: varies both due to the location where an exposure (i.e., outcrop) cuts through these three- dimensional objects, and because zonation among different pegmatites is heterogeneous. 0 out of 1 points Pegmatites are rich in rare elements because Selected 0 0. Answer: they form from partial melting of chemically anomolous portions of the crust, such as mineralized dykes and veins. Correct 0 d. Answer: they are the products of residual liquids produced from fractional crystallization of minerals containing common elements from granitic magmas. 1 out of1 points What are the two main colours of gem varieties of spodumene: Selected Answer: 0 a. pink and green Correct Answer: 0 a. pink and green 1 out of1 points https://connect.ubc.ca/webapps/assessment/review/review.jsp?attempt_id=_55291104_1&course_id=_92195_1&content_id=_3625663_1&outcome_id... 2/4 2016/11/26 Review Test Submission: Quiz 3 — 2016WA-EOSC118-... A fractionated magma is one which has: Selected o 0. Answer: many elements removed by the crystallization of earlier-stage (higher temperature) minerals Correct 0 0. Answer: many elements removed by the crystallization of earlier-stage (higher temperature) minerals Question 13 1 out of1 points Bicoloured tourmaline crystals develop because: Selected a d. Answer: the first preferred chromophore is used up during early crystal growth; the next preferred chromophore then substitutes into the crystal lattice Correct a d. Answer: the first preferred chromophore is used up during early crystal growth; the next preferred chromophore then substitutes into the crystal lattice QueStion 14 1 out of1 points Rare-element pegmatites are divided into two groups: LCT and NYF. The acronyms refer to: Selected Answer: *5 b. element names (or, geochemical type) Correct Answer: *5 b. element names (or, geochemical type) QueStion 15 0 out of 1 points Cut tanzanite for commercial retail is typically in the: Selected Answer: a d. 10 to 15 carat range. Correct Answer: a a. <5 carat range. Question 16 0 out of1 points High quality alexandrite is a special gemstone because Selected a b. Answer: it changes colour from red to green as a function of relative humidity, with greens corresponding to high humidity and red to low Correct {3 a. its colour changes from red to green depending on the lighting Answer: Question 17 1 out of1 points Which of the following were/are uses for amber? Check all that apply. a b. fishing buoys 0 e. jewellery Correct Answers: https://connect.ubc.ca/webapps/assessment/review/review.jsp?attempt_id=_55291104_1&course_id=_92195_1&content_id=_3625663_1&outcome_id... 3/4 201 6/ 11/26 Review Test Submission: Quiz 3 — 2016WA-EOSC118-... a b. fishing buoys a e. jewellery QueStion 18 0 out of 1 points What are(is) the chromophore(s) for tanzanite and which gems share these chromophore(s)? Selected Answer: a d. Copper; turquoise and lapis lazuli Correct Answer: a b. Vanadium; ruby and emerald QUGStion 19 0 out of1 points How could you tell the difference between a rough Maxixe stone and a rough Kashmir sapphire? Selected a e. Answer: those stones are different colours of the same mineral, therefore colour is the best way to tell them apart. Correct {5 c. Kashmir sapphire is harder and has tapered (rather than flat) ends. Answer: Question 20 0 out of 1 points Bicoloured topaz crystals develop because: Selected a c. Answer: during initial crystallization, drastic shifts in the temperature causes the crystal lattice to bend analagously to organic protein folding; each side of the bend absorbs a different part of the light spectrum. Correct 0 b. Answer: the first chromophore partitions preferentially into the crystal structure over the second one, giving rise of its depletion; the second chromophore then substitutes into the crystal lattice, producing a new colour. Saturday, November 26, 2016 9:25:03 PM PST httpszllconnect.ubc.ca/webapps/assessment/review/review.jsp?attempt_id=_55291104_1&course_id=_92195_1&content_id=_3625663_1&outcome_id... 4/4 ...
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