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.
Discover The Origins Of These Cooking Tool NamesThough it might sound French, carafe actually comes from the Arabic word gharrafah meaning "dipper" or "drinking vessel."
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