Yttrialite

Formula: (Y,Th)₂Si₂O₇Mohs scale hardness: 5-5.5Specific gravity: 4.58 g/cm³Rare earth elements: Y^{Rare earth content, %: REO}max^{= 40,56 % (Y}2^O3⁾Other constituents, %: ThO2^{Mineralklasse: Silicate (Germanates)Uses:}References

1. https://en.wikipedia.org

2. http://webmineral.com/data/Yttrialite-(Y).shtml#.V6I7eaI8vYg

3. https://en.wikipedia.org/wiki/Yttrialite

4. http://www.mindat.org/min-4367.html