General Information:
Chemical Formula:K(Li,Al)3(Si,Al)4O10(F,OH)2
Composition:(Molecular Weight = 386.31 gm)Potassium 10.12 %
K Lithium 3.59 %
LiAluminum 6.98 %
AlSilicon 29.08 %
SiHydrogen 0.52 %
H Oxygen 49.70 %
O Empirical Formula: KLi2AlSi4O10(OH)2
Environment:Lithia-bearing pegmatites.
Locality:Pala, San Diego Co., California, USA.
Name Origin:From the Greek lepidion - "scale" and lithos - "stone."
Physical Properties: Cleavage:[001] Perfect
Color:colorless, gray white, grayish, yellowish, or white.
Density:2.8 - 2.9, Average = 2.84
Diaphaniety:Translucent
Habits:Platy - Sheet forms (e.g. micas)., Foliated - Two dimensional platy forms., Massive - Uniformly indistinguishable crystals forming large masses.
Hardness:2.5-3 - Finger Nail-Calcite
Luminescence:None.
Luster:Vitreous - Pearly
Streak:white
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