Ephesite

General Information: Chemical Formula:NaLiAl2(Al2Si2)O10(OH)2 Composition:(Molecular Weight = 388.04 gm)Sodium 5.92 % NaLithium 1.79 % LiAluminum 27.81 % AlSilicon 14.48 % SiHydrogen 0.52 % H Oxygen 49.48 % O  Empirical Formula: NaLiAl4Si2O10OH2 Environment:Peri-aluminous metamorphic rocks. Ca analog of muscovite. IMA Status:Approved IMA Locality:Gumuchdahg, Ephesus, near Izmir, Turkey. Name Origin:Named after the locality.Physical Properties: Cleavage:[001] Perfect Color:brownish pink, pearl gray, or pale green. Density:2.984 Diaphaniety:Translucent Hardness:3.5-4.5 Luster:Vitreous - Pearly Streak:whiteMore details...