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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