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streak plate

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.
See streak.

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Nearby words

  1. strayhorn, billy,
  2. strays,
  3. strayve,
  4. streak,
  5. streak culture,
  6. streaker,
  7. streaking,
  8. streaky,
  9. stream,
  10. stream capture
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.