General Information:
Chemical Formula:
Na6K2Si6Al6O24(SO4)·2(H2O)
Composition:
(Molecular Weight = 1,062.62 gm)
Potassium 7.36 % K
Sodium 12.98 % Na
Aluminum 15.23 % Al
Silicon 15.86 % Si
Hydrogen 0.38 % H
Sulfur 3.02 % S
Oxygen 45.17 % O
Empirical Formula:
K2Na6Si6Al6O24(SO4)·2(H2O)
Environment:
In a pumice quarry, in ejected blocks showing metasomatic effects. A product of reaction between trachitic magma and carbonate and sulfate rock in the volcanic vent.
IMA Status:
Approved IMA
Locality:
Casa Collina, Ptigliano, Tuscany, Italy.
Name Origin:
Named after the locality.
Physical Properties:
Cleavage:
[???] Indistinct
Color:
colorless.
Density:
2.37
Diaphaniety:
Transparent
Habits:
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline)., ,
Hardness:
5 - Apatite
Luster:
Vitreous (Glassy)
Streak:
white
More details...