Vote for your favorite mineral in #MinCup26! - Quartz vs. Asagiite
It's a classic vs a newbie as the most common named mineral in the crust Quartz is up against an exceedingly-rare sea foam-green mineral discovered just a few years ago Asagiite.
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Hellandite-(Y) from
Tawara (Tahara), Hirukawa, Nakatsugawa City, Gifu Prefecture, Japan


Locality type:Occurrence
Classification
Species:Hellandite-(Y)
Formula:(Ca,REE)4Y2Al◻2(B4Si4O22) (OH)2
Comments:In the redefinition of the nomenclature of the hellandite group and the first description of hellandite-(Y) included data from this locality (Oberti et al. 2002), hence it should be considered as one of the type localities.
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Hellandite-(Y) data
Locality Data:Click here to view Tawara (Tahara), Hirukawa, Nakatsugawa City, Gifu Prefecture, Japan
Data Identifiers
Mindat Occurrence Record ID:281695
Long-form Identifier:1:3:281695:1
GUID (UUID V4):0
References
Miyawaki, R. et al (1987) Kobutsugaku Zasshi, 18, 17–30
Oberti, Roberta, Ottolini, Luisa, Camara, Fernando, Della Ventura, Giancarlo (1999) Crystal structure of non-metamict Th-rich hellandite-(Ce) from Latium (Italy) and crystal chemistry of the hellandite-group minerals. American Mineralogist, 84 (5) 913-921 doi:10.2138/am-1999-5-626
Oberti, Roberta, Ventura, Giancarlo Della, Ottolini, Luisa, Hawthorne, Frank C., Bonazzi, Paola (2002) Re-definition, nomenclature and crystal-chemistry of the hellandite group. American Mineralogist, 87 (5) 745-752 doi:10.2138/am-2002-5-618
 
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