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Carbonate

Shomiokite-(Y)

Na₃Y(CO₃)₃·3H₂O
Hardness2–3
Crystal systemOrthorhombic
ClassCarbonate
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Shomiokite-(Y) specimen

Shomiokite-(Y) 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 FOV 3.8 x 2.6 mm.Via Jean-Pierre Beckerich (2002) MOB coll. This specimen is from the same find and has terminations similar to those on a self collected specimen confirmed at Laurentian University. This photo uses a combination of multi focus and cut and paste. — Photo: Modris Baum · Public domain

Shomiokite-(Y)

Shomiokite-(Y) is an IMA-recognized mineral species in the carbonate class, with the chemical formula Na₃Y(CO₃)₃·3H₂O.

It crystallizes in the orthorhombic crystal system (space group Pbn2_1).

Key properties: Mohs hardness 2–3; specific gravity 2.52; Dull, waxy to silky luster; optically biaxial.

IMA symbol Shom-Y, IMA status: approved, named in 1990.

Found in interstices and as large segregations in potassic feldspar in pegmatites (Mt. Alluaiv, Kola Peninsula, Russia); in association with an intrusive alkalic gabbro-syenite complex (Mont Saint-Hilaire, Canada).

It is found associated with Albite, cancrinite, aegirine, elpidite, natron, natroxalate, kogarkoite, villiaumite, neighborite, trona, sidorenkite, siderite, sphalerite (Mt. Alluaiv.

The name refers to the Shomiok River, in the Lovozero massif, flowing near Mt. Alluaiv, where the mineral was first found.

Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet. Browse more S minerals or help write this entry.