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Labradorite: Quiz


Question 1: It has also been reported in ________ and various other locations worldwide.
NorwayPolandUnited StatesGermany

Question 2: The labradorescence, or schiller effect, is the result of light ________ within lamellar intergrowths resulting from phase exsolution on cooling in the Boggild miscibility gap, An48-An58.
RefractionOpticsMetamaterialRefractive index

Question 3:
Labradorite ((Ca,Na)(Al,Si)4O8), a ________ mineral, is an intermediate to calcic member of the plagioclase series.
Silicate mineralsAnorthiteOrthoclaseFeldspar

Question 4: ________ varieties of labradorite exhibiting a high degree of labradorescence are called spectrolite; moonstone and sunstone are also commonly used terms, and high-quality samples with good qualities are desired for jewelry.

Question 5: The geological type area for labradorite is Paul's Island near the town of Nain in Labrador, ________.
United StatesUnited KingdomCanadaBarbados

Question 6: The ________ ranges from 1.555 to 1.575.
MetamaterialRefractive indexOpticsDispersion (optics)

Question 7: The ________ ranges from 2.71 to 2.74.
AluminiumRelative densitySurface tensionDensity

Question 8: It occurs as clear, white to gray, blocky to lath shaped grains in common mafic igneous rocks such as basalt and gabbro, as well as in ________.
Layered intrusionMoonAnorthositeAluminium

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