Assertion: white tin | /r/DistinctFrom | nonmetallic allotrope
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Source sentences:
text: White tin may also refer specifically to β-tin, the metallic allotrope of the pure element, as opposed to the nonmetallic allotrope α-tin, known as "gray tin", which occurs at temperatures below 13.2 °C (55.8 °F) (see Tin pest).