General Information:
Chemical Formula:
La(CO3)F
Composition:
(Molecular Weight = 217.91 gm)
Lanthanum 63.74 % La
Carbon 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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