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Demartin F , Gramaccioli C M , Pilati T , Sciesa E , The Canadian Mineralogist , 34 (1996) p.827-834, Sigismundite, (Ba,K,Pb)Na3(Ca,Sr)(Fe,Mg,Mn)14Al(OH)2(PO4)12, a new, Ba-rich member of the arrojadite group from Spluga Valley, Italy, Locality: Spluga Valley, Italy
Physical Properties of Arrojadite-(BaFe)
Cleavage:
{???} Perfect
Color:
Grayish green.
Density:
3.54
Diaphaneity:
Translucent
Fracture:
Brittle - Generally displayed by glasses and most non-metallic minerals.
Habit:
Aggregates - Made of numerous individual crystals or clusters.
Luster:
Greasy (Oily)
Streak:
white
Optical Properties of Arrojadite-(BaFe)
Gladstone-Dale:
CI meas= -0.011 (Superior) - where the CI = (1-KPDmeas/KC) CI calc= 0.08 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1671,KPDmeas= 0.1836,KC= 0.1816 Ncalc = 1.64 - 1.71
Optical Data:
Biaxial (+/-), b=1.65
Calculated Properties of Arrojadite-(BaFe)
Electron Density:
Bulk Density (Electron Density)=3.36 gm/cc note: Specific Gravity of Arrojadite-(BaFe) =3.54 gm/cc.
Fermion Index:
Fermion Index = 0.04 Boson Index = 0.96
Photoelectric:
PEArrojadite-(BaFe) = 178.53 barns/electron U=PEArrojadite-(BaFe) x relectron= 600.02 barns/cc.
Radioactivity:
GRapi = 2.40 (Gamma Ray American Petroleum Institute Units)
Concentration of Arrojadite-(BaFe) per GRapi unit = 41.73 (%)
Estimated Radioactivity from Arrojadite-(BaFe) - barely detectable
Arrojadite-(BaFe) Classification
Dana Class:
41.07.02a.05(41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen