Schairerite Mineral Data

Schairerite Mineral Data +

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General Schairerite Information

Chemical Formula:

Na21(SO4)7F6Cl

Composition:

Molecular Weight = 1,304.67 gm

Sodium 37.00 % Na 49.88 % Na₂O

Sulfur 17.20 % S 42.96 % SO₃

Chlorine 2.72 % Cl 2.72 % Cl

- % Cl -0.61 % -O=Cl₂

Oxygen 34.34 % O

Fluorine 8.74 % F 8.74 % F

- % F -3.68 % -O=F₂

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Na₂₁(SO₄)₇F₆Cl

Environment:

Continental evaporite deposits.

IMA Status:

Valid Species (Pre-IMA) 1931

Locality:

Drill core from the lower salt member at Searles Lake, San Bernardino Co., California. Link to MinDat.org Location Data.

Name Origin:

Named for John Frank Schairer (1904-1970), American physical chemist, Geophysical Laboratory, Washington, DC, USA.

Synonym:

ICSD 4289

PDF 16-165

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Schairerite Crystallography

Axial Ratios:

a:c = 1:1.58504

Cell Dimensions:

a = 12.17, c = 19.29, Z = 3; V = 2,474.25 Den(Calc)= 2.63

Crystal System:

Trigonal - Ditrigonal PyramidalH-M Symbol (3m) Space Group: P 3₁m

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.76(1), 3.52(0.8), 3.79(0.7),

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Physical Properties of Schairerite

Cleavage:

[???] Indistinct

Color:

Colorless.

Density:

2.61

Diaphaniety:

Transparent

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Habit:

Rhombohedral Crystals - Occurs as well-formed crystals showing rhobohedral crystals.

Hardness:

3.5 - Copper Penny

Luminescence:

Non-fluorescent.

Luster:

Vitreous (Glassy)

Magnetism:

Nonmagnetic

Streak:

white

Optical Properties of Schairerite

Gladstone-Dale:

CI meas= 0.076 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= 0.083 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1683,KPDmeas= 0.1695,KC= 0.1835

Optical Data:

Uniaxial (+), w=1.44, e=1.445, bire=0.0050.

Calculated Properties of Schairerite

Electron Density:

r_electron=2.55 gm/cc
note: r_Schairerite=2.61 gm/cc.

Fermion Index

Fermion Index = 0.00145
Boson Index = 0.99855

Photoelectric:

PE_Schairerite= 1.85 barns/electron
U=PE_Schairerite x r_electron= 4.72 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Schairerite is Not Radioactive

Schairerite Classification

Dana Class:

30.1.9.1 (30)Anhydrous Sulfates Containing Hydroxyl or Halogen

(30.1)where (A B)m (XO4)p Zq where m:p>2:1

(30.1.9)Dana Group

30.1.9.1 Schairerite Na21(SO4)7F6Cl P 3₁m 3m

Strunz Class:

VI/B.12-30 VI - Sulfates,Chromates,Molybdates and Tungstates

VI/B - Waterfree sulfates [SO4]2- with unfamiliar anions. mostly big cations

VI/B.12 - Sulphohalite - Caracolite series

VI/B.12-10 Sulphohalite Na6(SO4)2FCl F m3m 4/m 3 2/m

VI/B.12-20 Galeite Na15(SO4)5F4Cl P 3m 3m

VI/B.12-30 Schairerite Na21(SO4)7F6Cl P 3₁m 3m

VI/B.12-40 Kogarkoite Na3(SO4)F Unk (pseudo HEX-R) Mono

VI/B.12-50 Cesanite Na7Ca3(SO4)6(OH)·0.8(H2O) P 6 6

VI/B.12-60 Caracolite Na3Pb2(SO4)3Cl P 2₁/m 2/m

Other Schairerite Information

References:

NAME( MinRec) PHYS. PROP.(Dana8) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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Schairerite

Na21(SO4)7F6Cl
Dana No: 30.1.9.1 Strunz No: VI/B.12-30
Locality:

Notes: