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Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Habit:
Euhedral Crystals - Occurs as well-formed crystals showing good external form.
Habit:
Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Habit:
Massive - Granular - Common texture observed in granite and other igneous rock.
Hardness:
7.5 - Garnet
Luminescence:
Non-fluorescent.
Luster:
Vitreous (Glassy)
Streak:
dark green
Optical Properties of Hercynite
Gladstone-Dale:
CI meas= -0.017 (Superior) - where the CI = (1-KPDmeas/KC) CI calc= 0.064 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1865,KPDmeas= 0.2025,KC= 0.1991 Ncalc = 1.79 - 1.85
Optical Data:
Isotropic, n=1.8.
Calculated Properties of Hercynite
Electron Density:
Bulk Density (Electron Density)=3.82 gm/cc note: Specific Gravity of Hercynite =3.95 gm/cc.
Fermion Index:
Fermion Index = 0.0069886167 Boson Index = 0.9930113833
Photoelectric:
PEHercynite = 10.57 barns/electron U=PEHercynite x rElectron Density= 40.35 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Hercynite is Not Radioactive
Chemical Formula: 
