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.
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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