Aeschynite-(Y)

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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.

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General Aeschynite-(Y) Information

Chemical Formula:  (Y,Ca,Fe)(Ti,Nb)2(O,OH)6  
Composition:  Molecular Weight = 274.97 gm  
   Calcium    4.37 %  Ca    6.12 % CaO  
   Yttrium   19.40 %  Y    24.64 % Y2O3  
   Titanium  30.47 %  Ti   50.84 % TiO2  
   Niobium    8.45 %  Nb   12.08 % Nb2O5  
   Iron       2.03 %  Fe    2.61 % FeO  
   Hydrogen   0.37 %  H     3.28 % H2O  
   Oxygen    34.91 %  O  
            ______        ______   
            100.00 %       99.56 % = TOTAL OXIDE  
Empirical Formula:  Y0.6Ca0.3Fe2+0.1Ti1.75Nb0.25O5(OH)  
IMA Status:  Approved IMA 1966  
Locality:  Norway, Urstad, Hittero Link to MinDat.org Location Data.  
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.  
Synonym:  Eschynite

Physical Properties of Aeschynite-(Y)

Cleavage:  None  
Color:  Black, Brownish black, Brown, Brownish yellow, Yellowish.  
Density:  4.85 - 5.13, Average = 4.99  
Diaphaniety:  Transparent to subtranslucent  
Fracture:  Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.  
Habit:  Massive - Uniformly indistinguishable crystals forming large masses.  
Hardness:  5-6 - Between Apatite and Orthoclase  
Luster:  Adamantine - Resinous  
Streak:  reddish yellow
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