General Information:
Chemical Formula:(NH4)AlSi3O8·0.5(H2O)
Composition:(Molecular Weight = 266.28 gm)Aluminum 10.13 %
AlSilicon 31.64 %
SiHydrogen 1.89 %
H Nitrogen 5.26 %
N Oxygen 51.07 %
O Empirical Formula: (NH4)Al(Si3O8)·0.5(H2O)
Environment:Plagioclase altered by ammonium-bearing waters.
IMA Status:Approved IMA 1964
Locality:Sulfur Bank mine, end of east arm of clear Lake, Lake Co. California.
Name Origin:Named for Arthur Francis Buddington (1890-1980), American petrologist, Princeton University.
Physical Properties: Cleavage:[001] Good, [010] Distinct
Color:colorless or white.
Density:2.32
Diaphaniety:Transparent to Translucent
Habits:Cryptocrystalline - Occurs as crystals too small to distinguish with the naked eye., Pseudomorphous - Occurs in the form of another mineral.,
Hardness:5.5 - Knife Blade
Luster:Vitreous - Dull
Streak:white
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