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ATHENA

MINERALOGY

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Mineral: RIEBECKITE
Formula: ▢Na2(Fe2+3Fe3+2)Si8O22(OH)2
Crystal System: Monoclinic
Group: Amphibole supergroup, with (OH,F,Cl) dominant. Amphibole Na subgroup. Riebeckite group
IMA Number: 2012 s.p.
References: MM 33 (1963), 625; HB2/2 (1995); AM 107 (2022), 754; AM 108 (2023), 50
Type Locality: Socotra island, Indian Ocean, Yemen
Comments: ▢ = vacancy

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