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An unglazed piece of porcelain, used to test the characteristic streak of minerals by rubbing the mineral across the tile. Streak plates have a hardness of about 6.5 on the Mohs scale and cannot be used for testing harder minerals.
LigCap

A piece of white unglazed porcelain on which to test the streak of a mineral.

Sorry!I;m not that good at explaining.

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