General Information:
Chemical Formula:
Ca4Al6Si6O24CO3
Composition:
(Molecular Weight = 1,018.97 gm)
Calcium 15.73 % Ca
Aluminum 15.89 % Al
Silicon 24.81 % Si
Carbon 1.18 % C
Oxygen 42.39 % O
Empirical Formula:
Ca4Al6Si9O24(CO3)
Environment:
Small cavities in limestone ejecta blocks. Forms a series with marialite.
Locality:
Mte. Somma, Vesuvius, Italy.
Physical Properties:
Cleavage:
[???] Distinct, [???] Indistinct
Color:
bluish, brownish, colorless, violet, or greenish.
Density:
2.66 - 2.73, Average = 2.69
Diaphaniety:
Transparent to subtranslucent
Habits:
Massive - Granular - Common texture observed in granite and other igneous rock., Fibrous - Crystals made up of fibers., Columnar - Forms columns
Hardness:
5-6 - Between Apatite and Orthoclase
Luminescence:
Non-fluorescent.
Luster:
Vitreous - Resinous
Streak:
colorless
More details...