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Szymanski J T , The Canadian Mineralogist , 23 (1985) p.659-668, The crystal structure of plumbojarosite Pb[Fe3(SO4)2(OH)6]2
Physical Properties of Plumbojarosite
Cleavage:
{0001} Distinct
Color:
Yellowish brown, Dark brown, Golden brown.
Density:
3.6 - 3.67, Average = 3.63
Diaphaneity:
Translucent to subtranslucent
Fracture:
Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Tabular - Form dimensions are thin in one direction.
Hardness:
1.5-2 - Talc-Gypsum
Luminescence:
Non-fluorescent.
Luster:
Vitreous - Dull
Streak:
pale brown
Optical Properties of Plumbojarosite
Dichroism (e):
none.
Dichroism (w):
none.
Gladstone-Dale:
CI meas= 0.057 (Good) - where the CI = (1-KPDmeas/KC) CI calc= 0.048 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2307,KPDmeas= 0.2285,KC= 0.2424 Ncalc = 1.87 - 1.89
Optical Data:
Uniaxial (-), e=1.783, w=1.878, bire=0.0950.
Calculated Properties of Plumbojarosite
Electron Density:
Bulk Density (Electron Density)=3.43 gm/cc note: Specific Gravity of Plumbojarosite =3.60 gm/cc.
Fermion Index:
Fermion Index = 0.04 Boson Index = 0.96
Photoelectric:
PEPlumbojarosite = 305.43 barns/electron U=PEPlumbojarosite x rElectron Density=1,046.41 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Plumbojarosite is Not Radioactive
Plumbojarosite Classification
Dana Class:
30.02.05.06(30)Anhydrous Sulfates Containing Hydroxyl or Halogen