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25 Erdalkalimetalle (2. Hauptgruppe, 2. Gruppe) · 25.2 Vorkommen Beryll - 3 BeO •Al 2 O 3 • 6 SiO 2 = Be 3 Al 2 [Si 6 O 18] Smaragd - grün, durch Chrom - Fremdatome Aquamarin
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