General Information:
Chemical Formula:
Na2SiF6
Composition:
(Molecular Weight = 188.06 gm)
Sodium 24.45 % Na
Silicon 14.93 % Si
Fluorine 60.62 % F
Empirical Formula:
Na2SiF6
Environment:
Sublimate from fumaroles.
Locality:
Vesuvius, Italy.
Name Origin:
Named for Alessandro Malladra (1865-1945), Italian volcanologist, director of the Vesuvius Observatory.
Physical Properties:
Color:
rose, colorless, or white.
Density:
2.714 - 2.755, Average = 2.73
Diaphaniety:
Transparent
Habits:
Crystalline - Fine - Occurs as well-formed fine sized crystals., Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).,
Hardness:
3 - Calcite
Luster:
Vitreous - Greasy
Streak:
white
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