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Plagioclase: Quiz

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Question 1: Plagioclase is a major constituent mineral in the Earth's crust, and is consequently an important diagnostic tool in petrology for identifying the composition, origin and evolution of ________.
FelsicGraniteBasaltIgneous rock

Question 2: Sunstone is mainly oligoclase (sometimes albite) with flakes of ________.
HematiteMagnetiteGalenaCinnabar

Question 3: It is a relatively common and important rock-making mineral associated with the more acid rock types and in pegmatite dikes, often with rarer minerals like tourmaline and ________.
EmeraldBerylTopazUnited States

Question 4: Albite is named from the ________ albus, in reference to its unusually pure white color.
LatinRoman EmpireOld LatinVulgar Latin

Question 5: Oligoclase is common in ________, syenite, diorite and gneiss.
BasaltIgneous rockFelsicGranite

Question 6: A variety of labradorite known as spectrolite is found in ________.
EstoniaRussiaSwedenFinland

Question 7: It is named after ________, where it is a constituent of the intrusive igneous rock anorthosite which is composed almost entirely of plagioclase.
IqaluitNewfoundland (island)LabradorNewfoundland and Labrador

Question 8: Bytownite, named after the former name for Ottawa, ________ (Bytown), is a rare mineral occasionally found in more basic rocks.
CanadaUnited KingdomUnited StatesBarbados

Question 9: Plagioclase is an important series of tectosilicate minerals within the ________ family.
AnorthiteOrthoclaseIgneous rockFeldspar







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