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( 0 1 2) ( 1 1 1) ( 1 1 0) ( 0 1 1)
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Crystal Structure:
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Borene J , Bulletin de la Societe Francaise de Mineralogie et de Cristallographie , 93 (1970) p.185-189, Structure cristalline de la parabutlerite
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Habit:
Striated - Parallel lines on crystal surface or cleavage face.
Hardness:
2.5 - Finger Nail
Luster:
Vitreous (Glassy)
Streak:
light yellow
Optical Properties of Parabutlerite
Gladstone-Dale:
CI meas= 0.02 (Excellent) - where the CI = (1-KPDmeas/KC) CI calc= 0.016 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2623,KPDmeas= 0.2612,KC= 0.2666 Ncalc = 1.68
Optical Data:
Biaxial (+), a=1.589-1.598, b=1.66-1.663, g=1.737-1.75, bire=0.1480-0.1520, 2V(Calc)=86-88, 2V(Meas)=87. Dispersion r > v moderate.
Pleochroism (x):
colorless.
Pleochroism (y):
faint yellow.
Pleochroism (z):
light yellow.
Calculated Properties of Parabutlerite
Electron Density:
Bulk Density (Electron Density)=2.55 gm/cc note: Specific Gravity of Parabutlerite =2.54 gm/cc.
Fermion Index:
Fermion Index = 0.0072162779 Boson Index = 0.9927837221
Photoelectric:
PEParabutlerite = 8.92 barns/electron U=PEParabutlerite x rElectron Density= 22.76 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Parabutlerite is Not Radioactive
Parabutlerite Classification
Dana Class:
31.09.02.01(31)Hydrated Sulfates Containing Hydroxyl or Halogen