Gibbsite
Al(OH)₃
Oxides
Hardness —
· Monoclinic
Photo: David Hospital · CC BY 4.0
Ca₄(Mg₃Fe³⁺₉)O₄(Fe³⁺₉Si₃)O₃₆
Sapphirine supergroup, unassigned
Named after Boris E. Khesin
Source: Wikidata
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