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streak plate

streak plate in Science
streak plate  
  1. An unglazed piece of porcelain, such as a tile, 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.

  2. See streak.

The American HeritageĀ® Science Dictionary
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