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Crystal Structure:
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Basciano L C , Peterson R C , American Mineralogist , 93 (2008) p.853-862, Crystal chemistry of the natrojarosite-jarosite and natrojarosite-hydronium, jarosite solid-solution: A synthetic study with full Fe site occupancy, Locality: synthetic, Sample: R
Physical Properties of Natrojarosite
Cleavage:
{0001} Perfect
Color:
Yellow, Ochre yellow, Ochre brown.
Density:
2.9 - 3.3, Average = 3.09
Diaphaneity:
Transparent to Translucent
Fracture:
Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Habit:
Crystalline - Fine - Occurs as well-formed fine sized crystals.
Habit:
Fibrous - Crystals made up of fibers.
Habit:
Massive - Uniformly indistinguishable crystals forming large masses.
Hardness:
2.5-3.5 - Finger Nail-Copper Penny
Luminescence:
Non-fluorescent.
Luster:
Vitreous (Glassy)
Streak:
light yellow
Optical Properties of Natrojarosite
Dichroism (e):
colorless, very pale yellow, or pale greenish yellow.
Dichroism (w):
colorless, deep golden yellow, or deep golden yellow.
Gladstone-Dale:
CI meas= 0.035 (Excellent) - where the CI = (1-KPDmeas/KC) CI calc= 0.099 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.238,KPDmeas= 0.2548,KC= 0.2642 Ncalc = 1.77 - 1.88
Optical Data:
Uniaxial (-), e=1.75, w=1.83, bire=0.0800.
Calculated Properties of Natrojarosite
Electron Density:
Bulk Density (Electron Density)=3.06 gm/cc note: Specific Gravity of Natrojarosite =3.10 gm/cc.
Fermion Index:
Fermion Index = 0.008543976 Boson Index = 0.991456024
Photoelectric:
PENatrojarosite = 11.13 barns/electron U=PENatrojarosite x rElectron Density= 34.01 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Natrojarosite is Not Radioactive
Natrojarosite Classification
Dana Class:
30.02.05.02(30)Anhydrous Sulfates Containing Hydroxyl or Halogen