Locality: Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry; Carrière Mont Saint-Hilaire), Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada View window 3.2 x 2.3 mm. Found Nov 1999. MOB coll. Nice pale pink typically twinned xls. Note: Like many REE bearing minerals, the apparent color of horváthite depends on the light source – in this case tungsten. But these xls are pinker than most – at least in my experience. — Photo: Modris Baum · CC0
Horváthite-(Y)
Horváthite-(Y) is an IMA-recognized mineral species in the carbonate class, with the chemical formula NaY(CO₃)F₂.
It crystallizes in the orthorhombic crystal system (space group Pmcn).
Key properties: Mohs hardness 4; specific gravity 3.3; White streak; Vitreous luster; optically biaxial.
IMA symbol Hrv-Y, IMA status: approved, named in 1996.
A very rare, late-forming mineral in an altered pegmatite dike in nepheline syenite, part of an alkalic igneous complex.
It is found associated with Microcline, aegirine, dawsonite, rhodochrosite, sodalite, natrolite, albite, serandite, siderite, taeniolite, catapleiite, astrophyllite, genthelvite.
The mineral was named to honor Elsa Horváth (1947–) and László Horváth (1937–), husband and wife collectors of Mont Saint-Hilaire, Canada minerals.