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Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Habit:
Disseminated - Occurs in small, distinct particles dispersed in matrix.
Habit:
Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Hardness:
5-5.5 - Apatite-Knife Blade
Luminescence:
Non-fluorescent.
Luster:
Resinous - Greasy
Streak:
yellowish brown
Optical Properties of Pyrochlore
Gladstone-Dale:
CI meas= 0.208 (Poor) - where the CI = (1-KPDmeas/KC) CI calc= 0.203 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1992,KPDmeas= 0.1981,KC= 0.2501 Ncalc = 2.05 - 2.6
Optical Data:
Isotropic, n=1.9-2.2.
Reflectivity
Standardized Intensity (100%) Reflection Spectra of Pyrochlore in Air
λ
R
∑ R(λ)
400 nm
11.30
420 nm
11.20
440 nm
11.10
460 nm
11.00
480 nm
11.00
500 nm
10.90
520 nm
10.80
540 nm
10.70
560 nm
10.60
580 nm
10.50
600 nm
10.50
620 nm
10.40
640 nm
10.40
660 nm
10.40
680 nm
10.40
700 nm
10.40
Calculated Relative Intensity Colors of Pyrochlore in Air
Relative Intensity
0%
90%
100%
180%
270%
360%
450%
540%
630%
720%
810%
830%
R
Calculated Properties of Pyrochlore
Electron Density:
Bulk Density (Electron Density)=4.93 gm/cc note: Specific Gravity of Pyrochlore =5.27 gm/cc.
Fermion Index:
Fermion Index = 0.0002232777 Boson Index = 0.9997767223
Photoelectric:
PEPyrochlore = 80.27 barns/electron U=PEPyrochlore x rElectron Density= 395.72 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Pyrochlore is Not Radioactive
Pyrochlore Classification
Dana Class:
08.02.01.01(08)Multiple Oxides with Nb, Ta, and Ti
Chemical Formula: 
