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Menchetti S , Sabelli C , American Mineralogist , 65 (1980) p.940-946, Peretaite, CaSb4O4(OH)2(SO4)2*2H2O: Its atomic arrangement and twinning
Physical Properties of Peretaite
Cleavage:
{100} Perfect
Color:
Colorless, White.
Density:
4.06
Diaphaneity:
Transparent
Habit:
Tabular - Form dimensions are thin in one direction.
Hardness:
3.5-4 - Copper Penny-Fluorite
Luster:
Vitreous (Glassy)
Streak:
white
Optical Properties of Peretaite
Gladstone-Dale:
CI meas= 0.001 (Superior) - where the CI = (1-KPDmeas/KC) CI calc= 0.001 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2071,KPDmeas= 0.2071,KC= 0.2073 Ncalc = 1.84
Optical Data:
Biaxial (+), b=1.841
Calculated Properties of Peretaite
Electron Density:
Bulk Density (Electron Density)=3.71 gm/cc note: Specific Gravity of Peretaite =4.06 gm/cc.
Fermion Index:
Fermion Index = 0.0007721997 Boson Index = 0.9992278003
Photoelectric:
PEPeretaite = 184.76 barns/electron U=PEPeretaite x rElectron Density= 685.73 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Peretaite is Not Radioactive
Peretaite Classification
Dana Class:
31.06.04.01(31)Hydrated Sulfates Containing Hydroxyl or Halogen