用來檢測礦石的顏色，而據以分類
每包十片裝
尺寸：23×48×5mm
These 23 x 48 x 5mm unglazed porcelain tiles are ideal for streak testing of minerals.
The streak test is essential in mineral identification because it retains the color of the mineral.
Package of 10. White Streak Plates.
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