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Physical Properties of Fergusonite-(Y)
Cleavage:
{???} Indistinct
Color:
Black, Black, Brown, Gray, Yellow.
Density:
4.3 - 5.8, Average = 5.05
Diaphaneity:
Subtranslucent to opaque
Fracture:
Sub Conchoidal - Fractures developed in brittle materials characterized by semi-curving surfaces.
Habit:
Metamict - Mineral originally crystalline, now amorphous due to radiation damage.
Habit:
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Hardness:
5.5-6 - Knife Blade-Orthoclase
Luminescence:
Non-fluorescent.
Luster:
Sub Metallic
Magnetism:
Nonmagnetic
Streak:
brown
Optical Properties of Fergusonite-(Y)
Gladstone-Dale:
CI meas= 0.005 (Superior) - where the CI = (1-KPDmeas/KC) CI calc= -0.044 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2328,KPDmeas= 0.2218,KC= 0.223 Ncalc = 1.96 - 2.29
Optical Data:
Isotropic, n=2.05-2.19.
Calculated Properties of Fergusonite-(Y)
Electron Density:
Bulk Density (Electron Density)=4.60 gm/cc note: Specific Gravity of Fergusonite-(Y) =5.05 gm/cc.
Fermion Index:
Fermion Index = 0.00012497 Boson Index = 0.99987503
Photoelectric:
PEFergusonite-(Y) = 105.20 barns/electron U=PEFergusonite-(Y) x rElectron Density= 484.10 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Fergusonite-(Y) is Not Radioactive
Fergusonite-(Y) Classification
Dana Class:
08.01.01.01(08)Multiple Oxides with Nb, Ta, and Ti
Chemical Formula: 
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