Crust-like overgrowths and simple tetragonal tablets on subhedral lead, and on lead wire in a calcite-rich Mn oxide ore matrix. A late-stage fissure mineral in a skarn assemblage,
IMA Status:
Approved IMA 1998 (Dana # Added)
Locality:
Langban, Varmland, Sweden. Link to MinDat.org Location Data.
Name Origin:
The name is from the Greek philos (=loving) and lithos (=stone) in honor of the Friends of Mineralogy.
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Encrustations - Forms crust-like aggregates on matrix.
Habit:
Tabular - Form dimensions are thin in one direction.
Hardness:
3-4 - Calcite-Fluorite
Luster:
Adamantine
Streak:
white
Optical Properties of Philolithite
Gladstone-Dale:
CI meas= 0.011 (Superior) - where the CI = (1-KPDmeas/KC) CI calc= 0.015 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.158,KPDmeas= 0.1585,KC= 0.1603 Ncalc = 1.95
Optical Data:
Biaxial (+), a=1.92, b=1.94, g=1.95, bire=0.0300
Calculated Properties of Philolithite
Electron Density:
Bulk Density (Electron Density)=5.02 gm/cc note: Specific Gravity of Philolithite =5.91 gm/cc.
Fermion Index:
Fermion Index = 0.15 Boson Index = 0.85
Photoelectric:
PEPhilolithite =1,254.07 barns/electron U=PEPhilolithite x rElectron Density=6,300.79 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Philolithite is Not Radioactive
Chemical Formula: 
