Phosphorus
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“At the freezing point [phosphorus] hardens, becomes brittle, and shows, on being broken, evidences of crystalline structure, the crystals being dodecahedral.” —Hallock 1905
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Chemical Elements and CompoundsSource
V. I. Hallock I.C.S. Refrence Library (Scranton: International Textbook Company, 1905) 11:44
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