Reederite-(Y)

Reederite-(Y) is a rare mineral with the formula (Na,Mn,Fe)₁₅(Y,REE)₂(CO₃)₉(SO₃F)Cl. It is the only known mineral with fluorosulfate (fluorosulfonate). "REE" in the formula stands for rare earth elements other than yttrium, that is mostly cerium, with traces of neodymium, dysprosium, lanthanum and erbium. The formula also includes a Levinson suffix "-(Y)" pointing to the dominance of yttrium at the corresponding site. Reederite-(Y) crystallizes in the hexagonal crystal system with the space group P6, rarely seen among minerals.^[2][1][3]

Reederite-(Y)
General
Category	Carbonate minerals
Formula (repeating unit)	(Na,Mn,Fe)15(Y,REE)2(CO3)9(SO3F)Cl
Strunz classification	5.BF.20
Crystal system	Hexagonal
Crystal class	Trigonal dipyramidal (3m) H-M symbol: (6)
Space group	P6
Unit cell	a = 8.773, c = 10.746 [Å]; Z = 1
Identification
Color	yellow to orange-brown
Luster	vitreous
Streak	white
References	[1]

This article uses material from the Wikipedia article  Metasyntactic variable, which is released under the  Creative Commons Attribution-ShareAlike 3.0 Unported License.