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MINERALOGY

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Mineral: HELLANDITE-(Y)
Formula: (Ca3REE)4Y2Al▢2[Si4B4O22](OH)2
Crystal System: Monoclinic
Group: Hellandite group
IMA Number: 2002 s.p.
References: HB2/1 (1995); L 11(1999), 27; AM 87 (2002), 745; CM 53 (2015), 345
Type Locality: Lindvikskollen dike, Kragerø (Kragero), Telemark, Norway
Comments: ▢ = vacancy

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