General Information:
Chemical Formula:
(Ca/2,Na)0,3(Mg,Fe++)3(Si,Al)4O10(OH)2·4(H2O)
Composition:
(Molecular Weight = 480.19 gm)
Sodium 0.48 % Na
Calcium 0.83 % Ca
Magnesium 11.39 % Mg
Aluminum 5.62 % Al
Iron 8.72 % Fe
Silicon 17.55 % Si
Hydrogen 2.10 % H
Oxygen 53.31 % O
Empirical Formula:
Ca0.1Na0.1Mg2.25Fe2+0.75Si3AlO10(OH)2·4(H2O)
Environment:
Amygdaloidal cavities in basalts.
Locality:
Lizard Head in Cornwall, England.
Name Origin:
From the Latin, sapo meaning "soap.'
Physical Properties:
Cleavage:
[001] Perfect
Color:
white, yellowish white, greenish white, reddish white, or bluish white.
Density:
2.3
Diaphaniety:
Subtranslucent to opaque
Habits:
Massive - Uniformly indistinguishable crystals forming large masses., Granular - Generally occurs as anhedral to subhedral crystals in matrix.,
Hardness:
1.5-2 - Talc-Gypsum
Luminescence:
None.
Luster:
Earthy (Dull)
Streak:
white
More details...