Owl - coll. P.P. ATHENA

MINERALOGY
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Mineral:HELLANDITE-(Y)
Formula:(Ca3REE)4Y2Al[]2[Si4B4O22](OH)2
Crystal System:Monoclinic
Strunz Nr:8/F.36-10
Group:Hellandite Group
References:HB2/1 (1995); L 11(1999), 27; AM 87 (2002), 745
Type Locality:Lindvikskollen dike, Kragerø, Telemark, Norway
Comments:[] = vacancy

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