General Information:
Chemical Formula:Na2(Sr,Ba)2Ti3(SiO4)4(OH,F)2
Composition:(Molecular Weight = 891.53 gm)Barium 15.40 %
BaSodium 5.16 %
NaStrontium 19.66 %
SrTitanium 16.11 %
TiSilicon 12.60 %
SiHydrogen 0.23 %
H Oxygen 28.71 %
O Fluorine 2.13 %
F Empirical Formula: Na2Sr2BaTi3Si4O14(OH)2F
Name Origin:From the Greek, lampros - "luster" and fyllon - "leaf."
Physical Properties: Cleavage:[100] Good
Color:yellow or brown.
Density:3.44
Diaphaniety:Translucent
Habits:Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite), Stellate - Occurs as spherical, radial aggregates radiating from a "star" like point., Acicula r - Occurs as needle-like crystals.
Hardness:2.5 - Finger Nail
Luster:Vitreous - Pearly
Streak:brownish white
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