Rowlandite-(Y)
Rowlandite-(Y) is an IMA-recognized mineral species in the silicate class, with the chemical formula Fe²⁺Y₄(Si₂O₇)₂F₂.
It is a member of the Rowlandite structural group.
Key properties: Mohs hardness 5.5–6.5; specific gravity 4.39; Vitreous; waxy when altered luster; optically biaxial.
IMA symbol Row-Y, IMA status: approved, named in 1891.
Found in some rare-earth-rich pegmatites.
It is found associated with Gadolinite, yttrialite (Baringer Hill, Texas, USA).
The name refers to Henry Augustus Rowland (1848–1901), American physicist and spectroscopist, of Johns Hopkins University, Baltimore, Maryland, USA, student of the spectra of the rare earth elements.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet.
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