General Information:
Chemical Formula:La(CO3)F
Composition:(Molecular Weight = 217.91 gm)Lanthanum 63.74 %
LaCarbon 5.51 %
C Oxygen 22.03 %
O Fluorine 8.72 %
F Empirical Formula: La(CO3)F
IMA Status:Approved IMA 1987
Locality:Gallinas Mountains, New Mexico, USA.
Name Origin:Named after its locality Bastnas Mine, Riddarhyttan, Vastmanland, Sweden.
Physical Properties: Cleavage:[1011] Imperfect, [0001] Indistinct
Color:yellow or reddish brown.
Density:4.95 - 5, Average = 4.97
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:4-5 - Fluorite-Apatite
Luster:Vitreous - Greasy
Streak:white
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