Schlüterite-(Y)

schluterite-(Y)

bastnasite-(Ce)

thalenite-(Y)

hundholmenite-(Y)

Images

Formula: (Y,REE)₂AlSi₂O₇(OH)₂F
Sorosilicate (Si₂O₇ groups), yttrium-bearing mineral
Crystal system: Monoclinic
Specific gravity: 4.644 calculated
Hardness: 5½ to 6
Streak: White
Colour: Pale pink
Luminescence: Does not fluoresce under short wave UV
Environments

Pegmatites

Schluterite-(Y) is a relatively new mineral, approved in 2012 and to date (May 2026) reported only from the type locality.

Localities

At the type locality, the Stetind pegmatite, Narvik, Nordland, Norway, schlüterite-(Y) forms dense, fibrous, radiating aggregates (up to about 2 mm in size) diverging to individual needle-like crystals (up to about 1 mm long) in cavities. Crystals are acicular to bladed. Schlüterite-(Y) is transparent, pale pink with a white streak and a vitreous lustre, and does not fluoresce under short wave UV (MM 77.3.353-366).
Associated minerals include bastnäsite-(Ce), fluorite, thalénite-(Y), hematite, hundholmenite-(Y), kuliokite-(Y), perbøeite-(Ce), törnebohmite-(Ce) and vyuntspakhkite-(Y) (Mindat).
Schlüterite from the Stetind pegmatite - Image

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