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Physical Properties of Montroydite
Cleavage:
{010} Perfect
Color:
Red, Brownish red, Brown.
Density:
11.2
Diaphaneity:
Transparent to Translucent
Fracture:
Sectile - Curved shavings or scrapings produced by a knife blade, (e.g. graphite).
Habit:
Crystalline - Fine - Occurs as well-formed fine sized crystals.
Hardness:
1.5-2 - Talc-Gypsum
Luminescence:
Non-fluorescent.
Luster:
Adamantine
Magnetism:
Nonmagnetic
Streak:
reddish orange
Optical Properties of Montroydite
Gladstone-Dale:
CI meas= -0.094 (Poor) - where the CI = (1-KPDmeas/KC) CI calc= -0.089 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1339,KPDmeas= 0.1345,KC= 0.123 Ncalc = 2.38
Optical Data:
Biaxial (+), a=2.37, b=2.5, g=2.65, bire=0.2800
Calculated Properties of Montroydite
Electron Density:
Bulk Density (Electron Density)=9.14 gm/cc note: Specific Gravity of Montroydite =11.3 gm/cc.
Fermion Index:
Fermion Index = 0.27 Boson Index = 0.73
Photoelectric:
PEMontroydite =1,613.18 barns/electron U=PEMontroydite x rElectron Density=14747.22 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Montroydite is Not Radioactive
Chemical Formula: 
