Franklin, Sussex County, New Jersey, USA. Link to MinDat.org Location Data.
Name Origin:
Named for Marion Stuart of Bellvue, Idaho, who has been a staunch supporter of the preservation of natural history specimens, particularly those of geological interest.
Lath - Shaped like a small, thin plaster lath, tabular (rectangular) in shape.
Hardness:
6 - Orthoclase
Luster:
Vitreous (Glassy)
Streak:
white
Optical Properties of Marsturite
Gladstone-Dale:
CI meas= 0.022 (Excellent) - where the CI = (1-KPDmeas/KC) CI calc= 0.025 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2003,KPDmeas= 0.2009,KC= 0.2054 Ncalc = 1.71
Optical Data:
Biaxial (+), a=1.686, b=1.691, g=1.708, bire=0.0220, 2V(Calc)=58, 2V(Meas)=60. Dispersion r > v weak.
Calculated Properties of Marsturite
Electron Density:
Bulk Density (Electron Density)=3.37 gm/cc note: Specific Gravity of Marsturite =3.46 gm/cc.
Fermion Index:
Fermion Index = 0.01 Boson Index = 0.99
Photoelectric:
PEMarsturite = 8.64 barns/electron U=PEMarsturite x rElectron Density= 29.13 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Marsturite is Not Radioactive
Chemical Formula: 
