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Schairerite

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J. Frank Schairer
Formula:
Na21(SO4)7ClF6
Colour:
Colourless; colourless in transmitted light.
Lustre:
Vitreous
Hardness:
Specific Gravity:
2.612
Crystal System:
Trigonal
Name:
Named in 1941 by William Frederick Foshag in honor of John Frank Schairer [April 13, 1904 Rochester, New York, USA –September 26, 1970 Point-no-Point, Maryland], physical chemist who studied phase equilibria of rock-forming silicates and rocks in silica-saturated and under-saturated systems,and co-authored papers on the same with Norman L. Bowen, Hatten S. Yoder, Jr., et al. at the Geophysical Laboratory, Washington, D.C. During World War II, Schairer developed alloys that greatly improved performance of small weapons. Schairer was president of the Mineralogical Society of America and other important professional organizations and received many awards and recognitions during his career.
This page provides mineralogical data about Schairerite.


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Classification of SchaireriteHide

Approved, 'Grandfathered' (first described prior to 1959)
7.BD.10

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
B : Sulfates (selenates, etc.) with additional anions, without H2O
D : With only large cations
30.1.9.1

30 : ANHYDROUS SULFATES CONTAINING HYDROXYL OR HALOGEN
1 : (AB)m(XO4)pZq, where m:p>2:1
26.3

26 : Sulphates with Halide

Physical Properties of SchaireriteHide

Vitreous
Transparency:
Transparent
Colour:
Colourless; colourless in transmitted light.
Hardness:
3½ on Mohs scale
Tenacity:
Brittle
Fracture:
Conchoidal
Density:
2.612 g/cm3 (Measured)    2.67 g/cm3 (Calculated)

Optical Data of SchaireriteHide

Type:
Uniaxial (+)
RI values:
nω = 1.440 nε = 1.445
Max Birefringence:
δ = 0.005
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate

Chemical Properties of SchaireriteHide

Formula:
Na21(SO4)7ClF6

Crystallography of SchaireriteHide

Crystal System:
Trigonal
Class (H-M):
3m (3 2/m) - Hexagonal Scalenohedral
Cell Parameters:
a = 12.17 Å, c = 19.29 Å
Ratio:
a:c = 1 : 1.585
Unit Cell V:
2,474.25 ų (Calculated from Unit Cell)
Morphology:
Crystals rhombohedral with {03_32} prominent. Artificial crystals are tabular {0001}.
Twinning:
Common on {0001}.

Type Occurrence of SchaireriteHide

Other Language Names for SchaireriteHide

Related Minerals - Nickel-Strunz GroupingHide

7.BD.05SulphohaliteNa6(SO4)2FClIso. m3m (4/m 3 2/m)
7.BD.05SulfohaliteNa6(SO4)2FCl
7.BD.10GaleiteNa15(SO4)5F4ClTrig.
7.BD.15KogarkoiteNa3(SO4)FMon.
7.BD.20CaracoliteNa3Pb2(SO4)3ClMon.
7.BD.20CesaniteNa3Ca2(SO4)3(OH)Hex.
7.BD.20AiolositeNa4Bi(SO4)3ClHex. 6/m : P63/m
7.BD.25BurkeiteNa6(CO3)(SO4)2Orth.
7.BD.30HanksiteNa22K(SO4)9(CO3)2ClHex. 6/m : P63/m
7.BD.35CannoniteBi2(SO4)O(OH)2Mon. 2/m : P21/b
7.BD.40LanarkitePb2(SO4)OMon. 2/m : B2/m
7.BD.45GrandreefitePb2(SO4)F2Mon. 2/m
7.BD.50ItoitePb3Ge4+(SO4)2O2(OH)2Orth. mmm (2/m 2/m 2/m) : Pnma
7.BD.55ChiluiteBi3Te6+Mo6+O10.5Hex.
7.BD.60HectorfloresiteNa9(SO4)4(IO3)Mon. 2/m : P21/b
7.BD.65PseudograndreefitePb6(SO4)F10Orth. 2 2 2 : F2 2 2
7.BD.70SundiusitePb10(SO4)O8Cl2Mon.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

26.1KogarkoiteNa3(SO4)FMon.
26.2SulphohaliteNa6(SO4)2FClIso. m3m (4/m 3 2/m)
26.4GaleiteNa15(SO4)5F4ClTrig.
26.5ConnelliteCu19(SO4)(OH)32Cl4 · 3H2OHex. 6 m2 : P62c
26.6ChlorothioniteK2Cu(SO4)Cl2Orth. mmm (2/m 2/m 2/m) : Pnma
26.7KamchatkiteKCu3(SO4)2OClOrth. mmm (2/m 2/m 2/m) : Pnma
26.8SpangoliteCu6Al(SO4)(OH)12Cl · 3H2OTrig. 3m : P3 1c
26.9AubertiteCuAl(SO4)2Cl · 14H2OTric. 1
26.10Magnesioaubertite(Mg,Cu)Al(SO4)2Cl · 14H2O
26.11Svyazhinite(Mg,Mn2+,Ca)(Al,Fe3+)(SO4)2F · 14H2OTric.
26.12D'AnsiteNa21Mg(SO4)10Cl3Iso.
26.13AnhydrokainiteKMg(SO4)Cl
26.14KainiteKMg(SO4)Cl · 3H2OMon. 2/m : B2/m
26.15Mosesite(Hg2N)(Cl,SO4,MoO4) · H2OIso.
26.16Kleinite(Hg2N)(Cl,SO4) · nH2OHex. 6/mmm (6/m 2/m 2/m) : P63/mmc
26.17WilcoxiteMgAl(SO4)2F · 17H2OTric. 1 : P1
26.18CreediteCa3SO4Al2F8(OH)2 · 2H2OMon. 2/m : B2/b
26.19LannoniteMg2Ca4Al4(SO4)8F8 · 24H2O Tet. 4/m : I4/m
26.20Chukhrovite-(Y)Ca3(Y,Ce)[F|SO4|(AlF6)2] · 10H2OIso.
26.21Chukhrovite-(Ce)Ca3(Ce,Y)[F|SO4|(AlF6)2] · 10H2OIso.
26.22GrandreefitePb2(SO4)F2Mon. 2/m
26.23PseudograndreefitePb6(SO4)F10Orth. 2 2 2 : F2 2 2
26.24SundiusitePb10(SO4)O8Cl2Mon.
26.25CaracoliteNa3Pb2(SO4)3ClMon.
26.26MammothitePb6Cu4AlSb5+O2(OH)16Cl4(SO4)2Mon. 2 : B2
26.27AtlasoviteK(BiO)Cu6Fe3+(SO4)5O3ClTet. 4/mmm (4/m 2/m 2/m) : P4/ncc
26.28XitieshaniteFe3+(SO4)Cl · 6H2OMon.
26.29NabokoiteKCu7(SO4)5(Te4+O3)OClTet.

Other InformationHide

Notes:
Slowly but completely soluble in water.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for SchaireriteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Foshag, W.F. (1931), Schairerite, a new mineral from Searles Lake, California, American Mineralogist: 16: 133-139.
Frondel, C. (1940) American Mineralogist: 25: 352.
Palache, Charles, Harry Berman & Clifford Frondel (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Seventh edition, Volume II: 547-548.
Wolfe, C.W.& Alice Caras (1951), Unit cell of schairerite: (abstract) Geological Society of America Bull.: 62: 1491; …American Mineralotgist: 36: 912-915.
Brown, F.H. and A. Pabst (1971), New data on galeite and schairerite: American Mineralogist: 56: 174-178.
Mineralogical Magazine (1975): 40: 131-139.

Internet Links for SchaireriteHide

Localities for SchaireriteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Canada
 
  • Québec
    • Montérégie
      • La Vallée-du-Richelieu RCM
        • Mont Saint-Hilaire
HORVÁTH, L., PFENNINGER-HORVÁTH, E. (2000) I minerali di Mont-Saint-Hilaire (Québec, Canada) Rivista Mineralogica Italiana, XXIV, 140-202 (in Italian with English summary).
Tanzania
 
  • Arusha Region
Mitchell, R.H. (2006) Mineralogy of stalactites formed by subaerial weathering of natrocarbonatite hornitos at Oldoinyo Lengai, Tanzania. Mineralogical Magazine: 70: 437-444
USA (TL)
 
  • California
    • San Bernardino Co.
Foshag, William Frederick (1931a), Schairerite, a new mineral from Searles Lake, California: American Mineralogist: 16: 133; Pabst, Adolf, Dwight L. Sawyer, Jr. & George S. Switzer (1963), Galeite and related phases in the system Na2SO4.NaF.NaCl: American Mineralogist: 48: 485; Smith, George Irving & D.V. Haines (1964), Character and distribution of nonclastic minerals in the Searles Lake evaporite deposit, California: USGS Bulletin 1181-P: 27, 32; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 280; Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 340, 548.
Mineral and/or Locality  
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