General Information:
Chemical Formula:
Na15Y2(CO3)9(SO3F)Cl
Composition:
(Molecular Weight = 1,197.26 gm)
Sodium 28.80 % Na
Yttrium 14.85 % Y
Carbon 9.03 % C
Sulfur 2.68 % S
Chlorine 2.96 % Cl
Oxygen 40.09 % O
Fluorine 1.59 % F
Empirical Formula:
Na15Y2(CO3)9(SO3)FCl
Environment:
Inclusions in a trona-filled vug in a sodalite xenolith in syenite.
IMA Status:
Approved IMA
Locality:
Poudrette Quarry, Mont Saint-Hilaire, Rouville County, Quebec, Canada.
Name Origin:
For Dr. Richard J. Reeder, currently co-editor of the American Mineralogist.
Physical Properties:
Cleavage:
[001] Perfect
Color:
yellow or orange brown.
Density:
2.91
Diaphaniety:
Transparent
Habits:
Blocky - Crystal shape tends to be equant (e.g. feldspars)., Granular - Generally occurs as anhedral to subhedral crystals in matrix.,
Hardness:
3-3.5 - Calcite-Copper Penny
Luminescence:
Non-fluorescent.
Luster:
Vitreous (Glassy)
Streak:
white
More details...