Yftisite-(Y) Mineral Data Pronunciation Guide

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General Information
Chemical Formula:	(Y,Dy,Er)4(Ti,Sn)O(SiO4)2(F,OH)6
IMA Status:	Discredited IMA 1987
Classification
Dana Class:	52.4.4.3 (52)Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O
	(52.4)with cations in [6] and/or > [6] coordination
	(52.4.4)Natisite - Yftisite group
Strunz Class:	VIII/B.14-10 VIII - Silicates
	VIII/B - Nesosubsilicates, with anions unfamiliar to tetraheders, cationes with coordinationnumber between [8] and [12]
	VIII/B.14 - Yftisite-(Y) ? series
Crystallography
Axial Ratios:	a:b:c =1.4148:1:0.6634
Cell Dimensions:	a = 15.04, b = 10.63, c = 7.052, Z = 4; V = 1,127.44
Crystal System:	Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Cmcm
X Ray Diffraction:	By Intensity(I/Io): 1.766(1) 2.667(1) 3.099(1)
Physical Properties
Cleavage:	None
Color:	yellow.
Density:	3.96
Diaphaniety:	Transparent
Hardness:	3.5-4 - Copper Penny-Flourite
Luster:	Vitreous - Greasy
Optical Properties
Optical Data:	Biaxial (-), a=1.69, b=1.705, g=1.71-1.712, bire=0.0200-0.0220
Other Information
References:	PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
See Also:	Links to other data for Yftisite-(Y) :   1 - EUROmin Project   2 -MinDat.org Location Data   3 -MinMax Search for Yftisite-(Y) using: [ALTAVISTA] [All-The-Web] [EXCITE] [GO.COM] [GOOGLE] [LYCOS] [LookSmart] [MAMMA] [MSN.COM] [NORTHERN LIGHT] [YAHOO] Visit our Advertisers for Yftisite-(Y) : The Arkenstone Fine Minerals John Betts Fine Minerals Dakota Matrix Minerals Exceptional Minerals Fabre Minerals JCrystal Software OsoSoft Minerals Rare Minerals Tsumeb Minerals Dan Weinrich Fine Minerals

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