Bastnasite-(Y)

General Information:
 Chemical Formula:
Y(CO3)F
 Composition:
(Molecular Weight = 167.91 gm)
Yttrium 52.95 % Y 
Carbon 7.15 % C 
Oxygen 28.59 % O 
Fluorine 11.31 % F 
 Empirical Formula:
Y(CO3)F
 IMA Status:
Approved IMA 1970
 Locality:
Kazakhstan.
 Name Origin:
Named as the Y end member and after the Bastnas Mine, Riddarhyttan, Vastmanland, Sweden.
Physical Properties:
 Cleavage:
[1011] Imperfect, [0001] Indistinct
 Color:
yellow or reddish brown.
 Density:
4.9 - 5, Average = 4.95
 Diaphaniety:
Transparent to Translucent
 Habits:
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline)., Massive - Granular - Common texture observed in granite and other igneous rock.,
 Hardness:
4-4.5 - Between Fluorite and Apatite
 Luster:
Vitreous - Greasy
 Streak:
white
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