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Effenberger H , Neues Jahrbuch fur Mineralogie, Monatshefte , 1986 (1986) p.101-110, Likasite, Cu3(OH)5(NO3)*2(H2O): Revision of the chemical formula and, redetermination of the crystal structure, Locality: Likasi Mine, Zaire
Physical Properties of Likasite
Cleavage:
{001} Perfect
Color:
Blue.
Density:
2.96 - 2.98, Average = 2.97
Habit:
Massive - Uniformly indistinguishable crystals forming large masses.
Habit:
Tabular - Form dimensions are thin in one direction.
Streak:
light blue
Optical Properties of Likasite
Gladstone-Dale:
CI meas= -0.007 (Superior) - where the CI = (1-KPDmeas/KC) CI calc= -0.032 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2241,KPDmeas= 0.2189,KC= 0.2173 Ncalc = 1.63 - 1.65
Optical Data:
Biaxial (-), a=1.615, g=1.685, bire=0.0700
Pleochroism (x):
blue green.
Pleochroism (z):
pale blue.
Calculated Properties of Likasite
Electron Density:
Bulk Density (Electron Density)=2.91 gm/cc note: Specific Gravity of Likasite =2.97 gm/cc.
Fermion Index:
Fermion Index = 0.03 Boson Index = 0.97
Photoelectric:
PELikasite = 22.06 barns/electron U=PELikasite x rElectron Density= 64.18 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Likasite is Not Radioactive