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Cooper M A , Hawthorne F C , Grew E S , American Mineralogist , 84 (1999) p.764-768, The crystal chemistry of sogdianite, a milarite-group mineral, Note: U(1,2) for Li2 changed to match symmetry constraints.
View Additional jPOWD Structure files for Sogdianite
[1]
Physical Properties of Sogdianite
Cleavage:
{0001} Perfect
Color:
Violet.
Density:
2.9
Diaphaneity:
Transparent
Hardness:
7 - Quartz
Luster:
Vitreous (Glassy)
Optical Properties of Sogdianite
Gladstone-Dale:
CI meas= 0.032 (Excellent) - where the CI = (1-KPDmeas/KC) CI calc= 0.008 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2145,KPDmeas= 0.2093,KC= 0.2162 Ncalc = 1.61 - 1.63
Optical Data:
Uniaxial (-), e=1.606, w=1.608, bire=0.0020.
Calculated Properties of Sogdianite
Electron Density:
Bulk Density (Electron Density)=2.78 gm/cc note: Specific Gravity of Sogdianite =2.83 gm/cc.
Fermion Index:
Fermion Index = 0.02 Boson Index = 0.98
Photoelectric:
PESogdianite = 14.67 barns/electron U=PESogdianite x relectron= 40.74 barns/cc.
Radioactivity:
GRapi = 79.14 (Gamma Ray American Petroleum Institute Units)
Concentration of Sogdianite per GRapi unit = 1.26 (%)
Estimated Radioactivity from Sogdianite - barely detectable