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Formula: Y4(SiO4)(Si3O10)
Silicate, yttrium-bearing mineral
Crystal system: Triclinic
Specific gravity: 5.1 measured, 5.24 calculated
Hardness: 4
Streak: White
Colour: Colourless or white, yellow or brownish
Solubility: Does not react with concentrated hydrochloric, sulphuric or nitric acid at room temperature
Environments
Anorthoyttrialite-(Y) is a new mineral, approved in 2023 and to date (October 2025) reported only from Narvik.
Localities
At the type locality, the Stetind pegmatite, Narvik, Nordland, Norway, anorthoyttrialite-(Y) occurs as
inclusions in yttrium-bearing
fluorite, associated with
allanite-(Ce),
alnaperbøeite-(Ce),
bastnäsite-(Ce), fluorite,
hematite,
hundholmenite-(Y),
perbøeite-(Ce),
rowlandite-(Y),
schlüterite-(Y),
synchysite-(Y),
thalénite-(Y),
törnebohmite-(Ce) and
vyuntspakhkite-(Y).
Anorthoyttrialite-(Y) forms translucent tabular or needle shaped crystals, which are colourless or white,
yellow or brownish
(MM 89.3.428-442).
Anorthoyttrialite-(Y) from the Stetind
pegmatite - Image
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