Aeschynite-(Y)

Aeschynite-(Y) (or Aeschinite-(Y), Aeschynite-(Yt), Blomstrandine, Priorite) (Y,Ca,Fe,Th)(Ti,Nb)2(O,OH)6 is a mineral of yttrium, calcium, iron, thorium, titanium, niobium, oxygen, and hydrogen. Its name comes from the Greek word for "shame". Its Mohs scale rating is 5 to 6.
See more at Wikipedia.org...

General Information:
 Chemical Formula:
(Y,Ca,Fe)(Ti,Nb)2(O,OH)6
 Composition:
(Molecular Weight = 274.97 gm)
Calcium 4.37 % Ca
Yttrium 19.40 % Y 
Titanium 30.47 % Ti
Niobium 8.45 % Nb
Iron 2.03 % Fe
Hydrogen 0.37 % H 
Oxygen 34.91 % O 
 Empirical Formula:
Y0.6Ca0.3Fe2+0.1Ti1.75Nb0.25O5(OH)
 IMA Status:
Accepted IMA 1966
 Locality:
TL: Norway, Urstad, Hittero
 Name Origin:
Named for its composition and from the Greek for "shame," in allusion to the inability of chemists, at the time of its discovery, to separate some of its constituents.
Physical Properties:
 Cleavage:
None
 Color:
black, brownish black, brown, brownish yellow, or yellowish.
 Density:
4.85 - 5.13, Average = 4.99
 Diaphaniety:
Transparent to subtranslucent
 Habits:
Massive - Uniformly indistinguishable crystals forming large masses., ,
 Hardness:
5-6 - Between Apatite and Orthoclase
 Luster:
Adamantine - Resinous
 Streak:
reddish yellow
More details...