General Information:
Chemical Formula:
Na(Li,Al)3Al6(BO3)3Si6O18(OH)4
Composition:
(Molecular Weight = 916.68 gm)
Sodium 2.51 % Na
Lithium 1.89 % Li
Aluminum 19.13 % Al
Silicon 18.38 % Si
Boron 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
More details...