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Sen Gupta P K , Swihart G H , Dimitrijevic R , Hossain M B , American Mineralogist , 76 (1991) p.1400-1407, The crystal structure of luneburgite, Mg3(H2O)6[B2(OH)6(PO4)2]
Physical Properties of Luneburgite
Color:
White, Brownish white, Green, Colorless.
Density:
2.05
Diaphaneity:
Transparent to Translucent
Hardness:
2 - Gypsum
Luster:
Vitreous (Glassy)
Optical Properties of Luneburgite
Gladstone-Dale:
CI meas= -0.092 (Poor) - where the CI = (1-KPDmeas/KC) CI calc= -0.056 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2528,KPDmeas= 0.2615,KC= 0.2395 Ncalc = 1.49 - 1.51