General Information:
Chemical Formula:CaAl2Si6O16·5(H2O)
Composition:(Molecular Weight = 608.62 gm)Calcium 6.59 %
CaAluminum 8.87 %
AlSilicon 27.69 %
SiHydrogen 1.66 %
H Oxygen 55.20 %
O Empirical Formula: CaAl2Si6O16·5(H2O)
Environment:Alteration product in basalts.
IMA Status:Approved IMA 1972
Locality:Berufjord, Iceland.
Name Origin:From the Greek epi - "near" and the mineral Stilbite.
Physical Properties: Cleavage:[010] Perfect
Color:white, yellowish white, reddish white, or brownish white.
Density:2.2 - 2.3, Average = 2.25
Diaphaniety:Transparent to translucent
Habits:Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline)., Spherical - Spherical, rounded aggregates., Twinning Common - Crystals are usually twinned.
Hardness:4-5 - Fluorite-Apatite
Luminescence:None.
Luster:Vitreous (Glassy)
Streak:white
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