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Rius J , Louer D , Louer M , Gali S , Melgarejo J C , European Journal of Mineralogy , 12 (2000) p.581-588, Structure solution from powder data of the phosphate hydrate tinticite
Physical Properties of Tinticite
Color:
White, Light brown, Pale yellowish green.
Density:
2.8 - 2.94, Average = 2.87
Habit:
Cryptocrystalline - Occurs as crystals too small to distinguish with the naked eye.
Habit:
Earthy - Dull, clay-like texture with no visible crystalline affinities, (e.g. howlite).
Habit:
Nodular - Tuberose forms having irregular protuberances over the surface.
Hardness:
2.5 - Finger Nail
Luster:
Earthy (Dull)
Streak:
white
Optical Properties of Tinticite
Gladstone-Dale:
CI meas= 0.126 (Poor) - where the CI = (1-KPDmeas/KC) CI calc= 0.012 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2934,KPDmeas= 0.2597,KC= 0.2971 Ncalc = 1.75 - 1.87
Optical Data:
Biaxial (?), a=1.745, g=1.7455, bire=0.0005
Calculated Properties of Tinticite
Electron Density:
Bulk Density (Electron Density)=2.50 gm/cc note: Specific Gravity of Tinticite =2.54 gm/cc.
Fermion Index:
Fermion Index = 0.008464055 Boson Index = 0.991535945
Photoelectric:
PETinticite = 12.55 barns/electron U=PETinticite x rElectron Density= 31.37 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Tinticite is Not Radioactive
Tinticite Classification
Dana Class:
42.12.04.01(42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen