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Physical Properties of Pyrostilpnite
Cleavage:
{010} Perfect
Color:
Hyacinth red, Orange red.
Density:
4.25 - 5.94, Average = 5.09
Diaphaneity:
Translucent
Fracture:
Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).
Habit:
Acicular - Occurs as needle-like crystals.
Habit:
Crystalline - Fine - Occurs as well-formed fine sized crystals.
Hardness:
2 - Gypsum
Luster:
Adamantine
Streak:
orange yellow
Optical Properties of Pyrostilpnite
Optical Data:
Biaxial (+), a=2.7, b=2.7, g=2.7, bire=0.0000
Pleochroism (x):
lemon yellow.
Pleochroism (y):
lemon yellow.
Pleochroism (z):
lemon yellow.
Calculated Properties of Pyrostilpnite
Electron Density:
Bulk Density (Electron Density)=5.30 gm/cc note: Specific Gravity of Pyrostilpnite =5.98 gm/cc.
Fermion Index:
Fermion Index = 0.0013322529 Boson Index = 0.9986677471
Photoelectric:
PEPyrostilpnite = 229.29 barns/electron U=PEPyrostilpnite x rElectron Density=1,215.30 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Pyrostilpnite is Not Radioactive
Chemical Formula: 
