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Guggenheim S , Bailey S W , American Mineralogist , 63 (1978) p.186-187, Refinement of the margarite structure in subgroup symmetry: correction,, further refinement, and comments
Physical Properties of Margarite
Cleavage:
{001} Good
Color:
White, Gray, Pinkish gray, Yellowish gray.
Density:
2.99 - 3.08, Average = 3.03
Diaphaneity:
Translucent to subtranslucent
Fracture:
Brittle - Generally displayed by glasses and most non-metallic minerals.
Habit:
Lamellar - Thin laminae producing a lamellar structure.
Fluorescent, Short UV=sky blue, Long UV=strong sky blue.
Luster:
Pearly
Streak:
white
Optical Properties of Margarite
Gladstone-Dale:
CI meas= 0.028 (Excellent) - where the CI = (1-KPDmeas/KC) CI calc= 0.042 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2047,KPDmeas= 0.2077,KC= 0.2137 Ncalc = 1.64 - 1.66
Optical Data:
Biaxial (-), a=1.595-1.638, b=1.625-1.648, g=1.627-1.65, bire=0.0120-0.0320, 2V(Calc)=28-46, 2V(Meas)=26-67. Dispersion r < v.
Pleochroism (x):
colorless.
Pleochroism (y):
colorless.
Pleochroism (z):
colorless.
Calculated Properties of Margarite
Electron Density:
Bulk Density (Electron Density)=3.02 gm/cc note: Specific Gravity of Margarite =3.04 gm/cc.
Fermion Index:
Fermion Index = 0.0069559576 Boson Index = 0.9930440424
Photoelectric:
PEMargarite = 2.58 barns/electron U=PEMargarite x rElectron Density= 7.79 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Margarite is Not Radioactive
Margarite Classification
Dana Class:
71.02.02c.01(71)Phyllosilicate Sheets of Six-Membered Rings