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Any mineral on the hardness scale would scratch minerals below it on the scale. The student tested Mineral 1 and observed that it scratched all other minerals on the hardness scale except orthoclase. When Mineral 2 was tested against fluorite it was observed that neither mineral scratched each other. Which of these is a correct conclusion the student can make about Mineral 1 and Mineral 2?

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spraguer (Moderator)
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