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Hellandite-(Y)

Type Locality
Lindvikskollen quarry, Lindvikskollen-Kalstadgangen pegmatite, Kragerø, Telemark, Norway
Mineral Data
(Ca,REE)4Y2Al(Be,Li)2-xB4Si4O22(OH)2
Strunz: 
9.DK.20
Physical Properties
Crystal System: 
Monoclinic
Hardness: 
5.5
Synonyms
Synonyms: 
Hellandite-Y, Hellandite Y and Hellandite - Y