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Johnsen O , Leonardsen E S , Falth L , Annehed H , Neues Jahrbuch fur Mineralogie, Monatshefte , 1983 (1983) p.505-512, Crystal structure of kvanefjeldite: The introduction of [Si3O7OH], layers with eight-membered rings, Locality: Ilimaussaq alkaline intrusion, South Greenland
Physical Properties of Kvanefjeldite
Cleavage:
{010} Good, {101} Indistinct
Color:
Violet pink.
Density:
2.55
Hardness:
5.5-6 - Knife Blade-Orthoclase
Luster:
Vitreous (Glassy)
Streak:
white
Optical Properties of Kvanefjeldite
Gladstone-Dale:
CI meas= 0.003 (Superior) - where the CI = (1-KPDmeas/KC) CI calc= -0.001 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2083,KPDmeas= 0.2075,KC= 0.2081 Ncalc = 1.53