General Information:
Chemical Formula:
Na2(Sr,Ba)2Ti3(SiO4)4(OH,F)2
Composition:
(Molecular Weight = 891.53 gm)
Barium 15.40 % Ba
Sodium 5.16 % Na
Strontium 19.66 % Sr
Titanium 16.11 % Ti
Silicon 12.60 % Si
Hydrogen 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
More details...