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ATHENA

MINERALOGY

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Mineral: HEYERDAHLITE
Formula: Na3Mn7Ti2(Si4O12)2O2(OH)4F(H2O)2
Crystal System: Anorthic (Triclinic)
Group: Astrophyllite supergroup
IMA Number: 2016-108
References: MM 81 (2017), 403-409; EJM 29 (2017), 342
Type Locality: Bratthagen road cut pegmatite, Lågendalen (Lagendalen), Hedrum, Larvik, Vestfold, Norway

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