John investigated the properties of two minerals and recorded his observations:
Feldspar is gray, dull, and breaks apart when it is rubbed.
Quartz is purple, glassy, and leaves a white streak when rubbed against a streak plate.
What observations show evidence about the luster of the two minerals? (2 points)
a
Feldspar is dull, while quartz is glassy.
b
Feldspar is gray, while quartz is purple.
c
Feldspar breaks apart when it is rubbed, while quartz does not.
d
Quartz leaves a white streak when rubbed, while feldspar does not.
Please use an answer like A B C or D
DO NOT USE THIS ANSWER!!
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John investigated the properties of two minerals and recorded his observations:
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