General Information:
Chemical Formula:(Ca,Na2,K2)Al2Si4O12·6(H2O)
Composition:(Molecular Weight = 515.67 gm)Potassium 4.55 %
K Sodium 2.67 %
NaCalcium 2.33 %
CaAluminum 10.46 %
AlSilicon 21.79 %
SiHydrogen 2.35 %
H Oxygen 55.85 %
O Empirical Formula: Ca0.3Na0.6K0.6Al2Si4O12·6(H2O)
Environment:Alteration of basaltic rocks.
Locality:Londonderry, Antrim Co., Ireland.
Name Origin:Named for Armand Levy (1794-1841), French mineralogist and crystallographer, Paris University, France.
Physical Properties: Cleavage:[1011] Perfect
Color:white, grayish white, reddish white, yellowish white, or gray.
Density:2.09 - 2.16, Average = 2.12
Habits:Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite), Fibrous - Crystals made up of fibers.,
Hardness:4-4.5 - Between Fluorite and Apatite
Luminescence:Non-fluorescent.
Luster:Vitreous (Glassy)
Streak:white
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