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Physical Properties of Spangolite
Cleavage:
{0001} Perfect, {1011} Distinct
Color:
Blue green, Green, Dark green, Emerald green.
Density:
3.1
Diaphaneity:
Transparent to Translucent
Fracture:
Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).
Habit:
Platy - Sheet forms (e.g. micas).
Habit:
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Habit:
Tabular - Form dimensions are thin in one direction.
Hardness:
2.5-3 - Finger Nail-Calcite
Luminescence:
Non-fluorescent.
Luster:
Vitreous (Glassy)
Magnetism:
Nonmagnetic
Streak:
light green
Optical Properties of Spangolite
Dichroism (e):
bluish green.
Dichroism (w):
weak green.
Gladstone-Dale:
CI meas= 0.002 (Superior) - where the CI = (1-KPDmeas/KC) CI calc= 0.012 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2133,KPDmeas= 0.2153,KC= 0.2158 Ncalc = 1.67 - 1.68
Optical Data:
Uniaxial (-), e=1.641, w=1.694, bire=0.0530.
Calculated Properties of Spangolite
Electron Density:
Bulk Density (Electron Density)=3.03 gm/cc note: Specific Gravity of Spangolite =3.10 gm/cc.
Fermion Index:
Fermion Index = 0.0004876892 Boson Index = 0.9995123108
Photoelectric:
PESpangolite = 21.29 barns/electron U=PESpangolite x rElectron Density= 64.51 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Spangolite is Not Radioactive
Spangolite Classification
Dana Class:
31.01.05.01(31)Hydrated Sulfates Containing Hydroxyl or Halogen
(31.01)where (A+ B++)m (XO4)p Zq�x(H2O), where m:p>6:1
Chemical Formula: 
