topaz will not leave a streak on an unglazed porcelain plate. why

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what method could be used to observe the streak of the topaz mineral?

Apr 30th, 2015

You can scratch it using another mineral that is harder or that is equally harder. Then observe the color of  the of the streak.

Apr 30th, 2015

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Apr 30th, 2015
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Apr 30th, 2015
Jun 29th, 2017
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