Product Review
These black, 1 x 2 inch unglazed porcelain tiles are ideal for streak testing minerals. The streak test is essential in mineral identification because it retains the color of the mineral. Pack of 10.
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These black, 1 x 2 inch unglazed porcelain tiles are ideal for streak testing minerals. The streak test is essential in mineral identification because it retains the color of the mineral. Pack of 10.
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