Question

A streak test is used to identify minerals by looking at the color of the streak made by rubbing the mineral against rough, uncolored ceramic or porcelain. The following table presents the colors of several minerals as well as the colors of the streaks they make.
Mineral Color Streak
Color
Gold golden yellow yellow
Pyrite golden yellow black
Quartz colorless white
Amethyst purple white
Hematite metallic gray red
Galena metallic gray lead gray
Which of the following pairs of minerals can be told apart by their color without performing a streak test?
A.
hematite and galena
B.
gold and pyrite
C.
quartz and amethyst
D.
all of these

Answer 1

C.  quartz and amethyst

Explanation:

Quartz and amethyst can be told apart by their color without performing a streak test on them.

This is because from the given choices, their color is different.

   quartz is a colorless

   amethyst is purple

• Quartz is silicate mineral purely made of silicon and oxygen.
• Amethyst is a variety of quartz but containing some mineral inclusions that makes its color different.
• Preforming the streak test gives their color to be white.
• This cannot be useful in identifying the minerals they contain.
• Since their natural colors are distinct, it is a more diagnostics tool .

learn more:

Silicate minerals brainly.com/question/4772323

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