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Physical Properties of Pyrope
Cleavage:
None
Color:
Blood red, Orange red, Purple red, Pink, Black red.
Density:
3.65 - 3.84, Average = 3.74
Diaphaneity:
Transparent to subtranslucent
Fracture:
Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).
Habit:
Crystalline - Fine - Occurs as well-formed fine sized crystals.
Habit:
Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Habit:
Lamellar - Thin laminae producing a lamellar structure.
Hardness:
7.5 - Garnet
Luminescence:
Non-fluorescent.
Luster:
Vitreous (Glassy)
Magnetism:
Nonmagnetic
Streak:
white
Optical Properties of Pyrope
Gladstone-Dale:
CI meas= 0.031 (Excellent) - where the CI = (1-KPDmeas/KC) CI calc= -0.019 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2093,KPDmeas= 0.1989,KC= 0.2053 Ncalc = 1.73 - 1.79
Optical Data:
Isotropic, n=1.73-1.76.
Calculated Properties of Pyrope
Electron Density:
Bulk Density (Electron Density)=3.53 gm/cc note: Specific Gravity of Pyrope =3.56 gm/cc.
Fermion Index:
Fermion Index = 0.02 Boson Index = 0.98
Photoelectric:
PEPyrope = 1.59 barns/electron U=PEPyrope x rElectron Density= 5.63 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Pyrope is Not Radioactive
Pyrope Classification
Dana Class:
51.04.03a.01(51)Nesosilicate Insular SiO4 Groups Only
Chemical Formula: 
