Gibbsite
Al(OH)₃
Oxides
Hardness —
· Monoclinic
Photo: David Hospital · CC BY-SA 4.0
Ca(Fe²⁺)₃MgAl₅(Si₆O₁₈)(BO₃)₃(OH)₃(OH)
Tourmaline mineral
Named after iron
Source: Wikidata
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