Put the following three minerals in order of increasing hardness: 1) plagioclase [PLAY-jee-uh-klays], 2) corundum, 3) gypsum. | ICStudy

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Put the following three minerals in order of increasing hardness: 1) plagioclase [PLAY-jee-uh-klays], 2) corundum, 3) gypsum.

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