General Information:
Chemical Formula:Na(Li,Al)3Al6(BO3)3Si6O18(OH)4
Composition:(Molecular Weight = 916.68 gm)Sodium 2.51 %
NaLithium 1.89 %
LiAluminum 19.13 %
AlSilicon 18.38 %
SiBoron 3.54 %
B Hydrogen 0.44 %
H Oxygen 54.11 %
O Empirical Formula: NaLi2.5Al6.5(BO3)3Si6O18(OH)4
Environment:Granitic pegmatites characterized by hydrothermal replacement.
Locality:Island of Elba, Italy.
Name Origin:Named after its locality.
Physical Properties: Cleavage:[1011] Indistinct
Color:blue, colorless, green, yellow, or white.
Density:2.9 - 3.2, Average = 3.05
Diaphaniety:Transparent to translucent to opaque
Habits:Striated - Parallel lines on crystal surface or cleavage face., Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).,
Hardness:7.5 - Garnet
Luminescence:Piezoelectric.
Luster:Vitreous (Glassy)
Streak:white
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