streak plate
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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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Which of the following nouns has an irregular plural form?
Words nearby streak plate
strays, strayve, streak, streak culture, streaking, streak plate, streaky, stream, streambed, streamer, streamer fly
The American Heritage® Science Dictionary
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