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

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

Apr 30th, 2015


Topaz is harder than unglazed porcelain, and leaves a scratch rather than a streak. Streak is the color of the powder of a mineral. To observe the steak of the topaz material, you scratch it with a harder mineral, or another mineral equally hard, and then you look at the color of the streak

Apr 30th, 2015

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Apr 30th, 2015
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Apr 30th, 2015
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