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.

Name Pronunciation:

Schairerite + Pronunciation

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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Forms: ( 1 1 1) ( 1 0 0) ( 0 1 2) ( 0 0 1)

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Crystal Structure:

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Fanfani L , Nunzi A , Zanazzi P F , Zanzari A R , Sabelli C , Mineralogical Magazine , 40 (1975) p.131-139, The crystal structure of schairerite and its relationship to sulphohalite, Locality: Searles Lake, California, USA

Physical Properties of Schairerite

Cleavage:

{???} Indistinct

Color:

Colorless.

Density:

2.61

Diaphaneity:

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
Ncalc = 1.48

Optical Data:

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

Calculated Properties of Schairerite

Electron Density:

Bulk Density (Electron Density)=2.55 gm/cc
note: Specific Gravity of Schairerite =2.61 gm/cc.

Fermion Index:

Fermion Index = 0.001455151
Boson Index = 0.998544849

Photoelectric:

PE_Schairerite= 1.85 barns/electron
U=PE_Schairerite x rElectron Density= 4.72 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Schairerite is Not Radioactive

Schairerite Classification

Dana Class:

30.01.09.01 (30)Anhydrous Sulfates Containing Hydroxyl or Halogen

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

(30.01.09)Dana Group

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

Strunz Class:

07.BD.10 07 - SULFATES (SELENATES, TELLURATES)

07.B - Sulfates (selenates, etc.) with Additional Anions, without H2O

07.BD -With only large cations

07.BD.10 Galeite Na15(SO4)5F4Cl P 3m 3m

07.BD.10 Schairerite Na21(SO4)7F6Cl P 3₁m 3m

Other Schairerite Information

References:

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

See Also:

Links to other databases for Schairerite :
1 - Alkali-Nuts(English)
2 - Alkali-Nuts(Francais)
3 - Am. Min. Crystal Structure Database
4 - Athena
5 - EUROmin Project
6 - Ecole des Mines de Paris
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - MinMax(Deutsch)
13 - MinMax(English)
14 - Mineralienatlas (Deutsch)
15 - QUT Mineral Atlas
16 - Ruff.Info
17 - WWW-MINCRYST

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Print or Cut-and-Paste your Schairerite Specimen Label here :

Schairerite

Na21(SO4)7F6Cl
Dana No: 30.01.09.01 Strunz No: 07.BD.10
Locality:

Notes: