Helvite Structure Data

Helvite Structure Data
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Helvite

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Helvite
Formula: Mn4 O12 Be3 Si3 S
Name: Helvite
Unit cell: 8.236 8.236 8.236 90.0 90.0 90.0 , V=558.66
Space group: P-43N (218)

Hassan I , Grundy H D , American Mineralogist , 70 (1985) p.186-192, The crystal structures of helvite group minerals, (MnFeZn)8(Be6Si6O24)S2

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