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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