Mineralogy Database

Schairerite Mineral Data

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General Schairerite Information

Help on Chemical  Formula: Chemical Formula: Na21(SO4)7F6Cl
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Na21(SO4)7F6Cl
Help on Environment: Environment: Continental evaporite deposits.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1931
Help on Locality: Locality: Drill core from the lower salt member at Searles Lake, San Bernardino Co., California. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for John Frank Schairer (1904-1970), American physical chemist, Geophysical Laboratory, Washington, DC, USA.
Help on Name Pronunciation: Name Pronunciation: Schairerite + Pronunciation Say SCHAIRERITE
Help on Synonym: Synonym: ICSD 4289
  PDF 16-165
 

Schairerite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:1.58504
Help on Cell Dimensions: Cell Dimensions: a = 12.17, c = 19.29, Z = 3; V = 2,474.25 Den(Calc)= 2.63
Help on Crystal System: Crystal System: Trigonal - Ditrigonal Pyramidal H-M Symbol (3m) Space Group: P 31m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.76(1), 3.52(0.8), 3.79(0.7),
Help on Forms: Forms:

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Help on Above

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

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Physical Properties of Schairerite

Help on Cleavage: Cleavage: {???} Indistinct
Help on Color: Color: Colorless.
Help on Density: Density: 2.61
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Habit: Habit: Rhombohedral Crystals - Occurs as well-formed crystals showing rhobohedral crystals.
Help on Hardness: Hardness: 3.5 - Copper Penny
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous (Glassy)
Help on Magnetism: Magnetism: Nonmagnetic
Help on Streak: Streak: white
 

Optical Properties of Schairerite

Help on Gladstone-Dale: 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
Help on Optical Data: Optical Data: Uniaxial (+), w=1.44, e=1.445, bire=0.0050.
 

Calculated Properties of Schairerite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.55 gm/cc
note: Specific Gravity of Schairerite =2.61 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.001455151
Boson Index = 0.998544849
Help on Photoelectric: Photoelectric: PESchairerite = 1.85 barns/electron
U=PESchairerite x rElectron Density= 4.72 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Schairerite is Not Radioactive
 

Schairerite Classification

Help on  Dana Class: 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
Help on  Strunz Class: 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

Help on References: References: NAME( MinRec) PHYS. PROP.(Dana8) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: 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 - GeoScienceWorld
8 - Google Images
9 - Google Scholar
10 - Handbook of Mineralogy (MinSocAm)
11 - Handbook of Mineralogy (UofA)
12 - MinDAT
13 - Mineralienatlas (Deutsch)
14 - Online Mineral Museum
15 - QUT Mineral Atlas
16 - Ruff.Info
17 - WWW-MINCRYST

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Schairerite

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