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Chrysoberyl: Quiz


Question 1:
What transport system is Chrysoberyl served by?
Orthorhombic 2/m2/m2/m

Question 2: These twinned crystals have a ________ appearance, but are the result of a triplet of twins with each "twin" oriented at 120o to its neighbors and taking up 120o of the cyclic trilling.
HexagonPolygonOctagonRegular polygon

Question 3: Some gemstones described as lab-grown (synthetic) alexandrite are actually corundum laced with trace elements (e.g., vanadium) or color-change ________ and are not actually chrysoberyl.

Question 4: Alexandrite, a strongly pleochroic (trichroic) gem, will exhibit ________ green, red and orange-yellow colors depending on viewing direction in partially polarised light.

Question 5: As a result, they would be more accurately described as simulated alexandrite rather than synthetic but are often called ________ Alexandrite after the process that grows the crystals.
GoldCzochralski processSiliconGermanium

Question 6: Hence, it can be found in mica schists and in contact with metamorphic deposits of ________ marble.
Calcium carbonateCalciteDolomiteMagnesite

Question 7: Much of the chrysoberyl mined in ________ and Sri Lanka is recovered from placers as the host rocks have been intensely weathered and eroded.
BrazilEast TimorMozambiquePortugal

Question 8: The mineral or gemstone chrysoberyl, not to be confused with ________, is an aluminate of beryllium with the formula BeAl2O4.
BerylUnited StatesEmeraldTourmaline

Question 9: Alexandrite results from small scale replacement of aluminium by ________ ions in the crystal structure, which causes intense absorption of light over a narrow range of wavelengths in the yellow region of the spectrum.

Question 10: Other varieties of alexandrite may be yellowish or pink in daylight and a columbine or ________ red by incandescent light.


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