What is rubbing a mineral against a piece of unglazed ceramic tile a test for?
Streak.
The streak test involves rubbing a mineral against an unglazed ceramic tile piece to determine the color of the mineral's powder. For instance, quartz, amethest (purple), rose quartz (pink), citrine (yellow), and smokey quartz (tea colored to almost black) are examples of minerals that have the same streak despite having quite different appearances.
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Rubbing a mineral against a piece of unglazed ceramic tile is a test for determining the mineral's streak color.
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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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