General Information:
Chemical Formula:
Na4(Ca,Ce)2(Fe++,Mn,Y)ZrSi8O22(OH,Cl)2 (?)
Composition:
(Molecular Weight = 992.15 gm)
Sodium 9.27 % Na
Calcium 6.06 % Ca
Cerium 7.06 % Ce
Yttrium 0.90 % Y
Zirconium 9.19 % Zr
Manganese 1.66 % Mn
Iron 3.38 % Fe
Silicon 22.65 % Si
Hydrogen 0.15 % H
Chlorine 1.79 % Cl
Oxygen 37.90 % O
Empirical Formula:
Na4Ca1.5Ce0.5Fe2+0.6Mn2+0.3Y0.1ZrSi8O22(OH)1.5Cl0.5
Environment:
Nepheline-syenite rocks.
IMA Status:
Approved IMA
Locality:
Julianehaab district of Greenland.
Name Origin:
From the Greek eu - "well" and dialytos - "decomposable."
Physical Properties:
Cleavage:
[0001] Imperfect
Color:
pinkish red, red, yellow, yellowish brown, or violet.
Density:
2.8 - 3, Average = 2.9
Diaphaniety:
Transparent to Translucent
Habits:
Massive - Granular - Common texture observed in granite and other igneous rock., Tabular - Form dimensions are thin in one direction.,
Hardness:
5-5.5 - Apatite-Knife Blade
Luminescence:
None.
Luster:
Vitreous (Glassy)
Streak:
white
More details...