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Answer:
4.b. cleavage
-This property of breaking along specific planes is termed cleavage. ... For example if a mineral has cleavage along {100} it will break easily along planes parallel to the (100) crystal face, and any other planes that are related to it by symmetry.
5.a. luster
-Luster describes the way light reflects off of the surface of the mineral. You might describe diamonds as sparkly or pyrite as shiny. But mineralogists have special terms to describe luster.
Explanation:
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