General Information:
Chemical Formula:Na2MgAlF7
Composition:(Molecular Weight = 230.25 gm)Sodium 19.97 %
NaMagnesium 10.56 %
MgAluminum 11.72 %
AlFluorine 57.76 %
F Empirical Formula: Na2MgAlF7
Environment:With cryolite and other fluorides.
Locality:Ivigtut, Greenland.
Name Origin:Named for Theobald C. F. Weber (1823-1886), one of the founders of the cryolite industry in Denmark.
Physical Properties: Cleavage:[101] Poor, [010] Indistinct
Color:greenish, gray, grayish white, or white.
Density:2.96
Diaphaniety:Translucent
Habits:Anhedral Grains - Granular minerals without the expression of crystal shapes, Massive - Uniformly indistinguishable crystals forming large masses.,
Hardness:3.5 - Copper Penny
Luster:Vitreous (Glassy)
Streak:white
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