What Is the Hardness of Schist? - Ask.com, The hardness of schist cannot be determined on MOHS scale. It is a rock made of several minerals, not just one. Reference: www.gemologyonline.com.

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Mohs Hardness Scale - Answers.com, Basalt is a rock containing various minerals. The Mohs scale is a measure of the relative hardness of individual minerals.

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What Is the Hardness of Schist? - Ask.com, The hardness of schist cannot be determined on MOHS scale. It is a rock made of several minerals. ... each of which have different MOHS hardness.

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