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Pyrite (FeS
2
)is an isometric mineral and a metal sulfide. Which way will it appear optically in thin
section?
Group of answer choices
a. Always dark (extinct) in both PPL and XPL
b. Always dark (extinct) in PPL only
c. Always dark (extinct) in XPL but not PPL
d. It goes dark (to extinction) 4X in a 360 degree rotation in XPL.

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Pyrite FeS2is an isometric mineral and a metal sulfide W.pdf

  • 1. Pyrite (FeS 2 )is an isometric mineral and a metal sulfide. Which way will it appear optically in thin section? Group of answer choices a. Always dark (extinct) in both PPL and XPL b. Always dark (extinct) in PPL only c. Always dark (extinct) in XPL but not PPL d. It goes dark (to extinction) 4X in a 360 degree rotation in XPL.