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Grice J D , The Canadian Mineralogist , 29 (1991) p.363-367, The crystal structure of silinaite, NaLiSi2O6.2H20: a monophyllosilicate, Locality: Mont Saint-Hilaire, Rouville County, Quebec, Canada
Physical Properties of Silinaite
Cleavage:
{001} Perfect, {010} Good, {110} Good
Color:
Colorless, White.
Density:
2.24
Diaphaneity:
Translucent to Opaque
Hardness:
4.5 - Between Fluorite and Apatite
Luster:
Vitreous - Dull
Streak:
white
Optical Properties of Silinaite
Gladstone-Dale:
CI meas= 0.024 (Excellent) - where the CI = (1-KPDmeas/KC) CI calc= 0.019 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2315,KPDmeas= 0.2305,KC= 0.2361 Ncalc = 1.53