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Schairerite

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Formula:
Na
 
3
(SO
 
4
)(F,Cl)
System:TrigonalColour:Colourless; colourless ...
Hardness:
Name:Named after John Frank Schairer (1904-1970), physical chemist, Geophysical Laboratory, Washington.
This page provides mineralogical data about Schairerite.

Classification of Schairerite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:6/B.12-30
Nickel-Strunz 10th (pending) edition ID:7.BD.10

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
B : Sulfates (selenates, etc.) with additional anions, without H2O
D : With only large cations
Dana 8th edition ID:30.1.9.1

30 : ANHYDROUS SULFATES CONTAINING HYDROXYL OR HALOGEN
1 : (AB)m(XO4)pZq, where m:p>2:1
Hey's CIM Ref.:26.3

26 : Sulphates with Halide
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Type Occurrence of Schairerite

Type Locality:Searles Lake, San Bernardino Co., California, USA
Year of Discovery:1931

Physical Properties of Schairerite

Lustre:Vitreous
Diaphaneity (Transparency):Transparent
Colour:Colourless; colourless in transmitted light.
Hardness (Mohs):
Tenacity:Brittle
Fracture:Conchoidal
Density (measured):2.612 g/cm3
Density (calculated):2.67 g/cm3

Crystallography of Schairerite

Crystal System:Trigonal
Class (H-M):3m (3 2/m) - Hexagonal Scalenohedral
Cell Parameters:a = 12.17Å, c = 19.29Å
Ratio:a:c = 1 : 1.585
Unit Cell Volume: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}.

Optical Data of Schairerite

Type:Uniaxial (+)
RI values: nω = 1.440 nε = 1.445
Maximum Birefringence:δ = 0.005

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate

Chemical Properties of Schairerite

Formula:
Na
 
3
(SO
 
4
)(F,Cl)
Simplified for copy/paste:Na3(SO4)(F,Cl)
Essential elements:F, Na, O, S
All elements listed in formula:Cl, F, Na, O, S

Relationship of Schairerite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
7.BD.05Sulphohalite
Na
 
6
(SO
 
4
)
 
2
FCl
7.BD.05Sulfohalite
7.BD.10Galeite
Na
 
15
(SO
 
4
)
 
5
F
 
4
Cl
7.BD.15Kogarkoite
Na
 
3
(SO
 
4
)F
7.BD.20Caracolite
Na
 
3
Pb
 
2
(SO
 
4
)
 
3
Cl
7.BD.20Cesanite
Na
 
3
Ca
 
2
(SO
 
4
)
 
3
(OH)
7.BD.20Aiolosite
Na
 
4
Bi(SO
 
4
)
 
3
Cl
7.BD.25Burkeite
Na
 
6
(CO
 
3
)(SO
 
4
)
 
2
7.BD.30Hanksite
Na
 
22
K(SO
 
4
)
 
9
(CO
 
3
)
 
2
Cl
7.BD.35Cannonite
Bi
 
2
(SO
 
4
)O(OH)
 
2
7.BD.40Lanarkite
Pb
 
2
(SO
 
4
)O
7.BD.45Grandreefite
Pb
 
2
(SO
 
4
)F
 
2
7.BD.50Itoite
Pb
 
3
Ge
4+
 
(SO
 
4
)
 
2
O
 
2
(OH)
 
2
7.BD.55Chiluite
Bi
 
3
Te
6+
 
Mo
6+
 
O
 
10.5
7.BD.60Hectorfloresite
Na
 
9
(SO
 
4
)
 
4
(IO
 
3
)
7.BD.65Pseudograndreefite
Pb
 
6
(SO
 
4
)F
 
10
7.BD.70Sundiusite
Pb
 
10
(SO
 
4
)O
 
8
Cl
 
2
Related Minerals - Hey's Index Grouping:

- +
26.1Kogarkoite
Na
 
3
(SO
 
4
)F
26.2Sulphohalite
Na
 
6
(SO
 
4
)
 
2
FCl
26.4Galeite
Na
 
15
(SO
 
4
)
 
5
F
 
4
Cl
26.5Connellite
Cu
 
19
(SO
 
4
)(OH)
 
32
Cl
 
4
· 3H
 
2
O
26.6Chlorothionite
K
 
2
Cu(SO
 
4
)Cl
 
2
26.7Kamchatkite
KCu
 
3
(SO
 
4
)
 
2
OCl
26.8Spangolite
Cu
 
6
Al(SO
 
4
)(OH)
 
12
Cl · 3H
 
2
O
26.9Aubertite
CuAl(SO
 
4
)
 
2
Cl · 14H
 
2
O
26.10Magnesioaubertite
(Mg,Cu)Al(SO
 
4
)
 
2
Cl · 14H
 
2
O
26.11Svyazhinite
(Mg,Mn
2+
 
,Ca)(Al,Fe
3+
 
)(SO
 
4
)
 
2
F · 14H
 
2
O
26.12D'Ansite
Na
 
21
Mg(SO
 
4
)
 
10
Cl
 
3
26.13Anhydrokainite
KMg(SO
 
4
)Cl
26.14Kainite
KMg(SO
 
4
)Cl · 3H
 
2
O
26.15Mosesite
(Hg
 
2
N)(Cl,SO
 
4
,MoO
 
4
) · H
 
2
O
26.16Kleinite
(Hg
 
2
N)(Cl,SO
 
4
) · nH
 
2
O
26.17Wilcoxite
MgAl(SO
 
4
)
 
2
F · 17H
 
2
O
26.18Creedite
Ca
 
3
SO
 
4
Al
 
2
F
 
8
(OH)
 
2
· 2H
 
2
O
26.19Lannonite
Mg
 
2
Ca
 
4
Al
 
4
(SO
 
4
)
 
8
F
 
8
· 24H
 
2
O
26.20Chukhrovite-(Y)
Ca
 
3
(Y,Ce)[F|SO
 
4
|(AlF
 
6
)
 
2
] · 10H
 
2
O
26.21Chukhrovite-(Ce)
Ca
 
3
(Ce,Y)[F|SO
 
4
|(AlF
 
6
)
 
2
] · 10H
 
2
O
26.22Grandreefite
Pb
 
2
(SO
 
4
)F
 
2
26.23Pseudograndreefite
Pb
 
6
(SO
 
4
)F
 
10
26.24Sundiusite
Pb
 
10
(SO
 
4
)O
 
8
Cl
 
2
26.25Caracolite
Na
 
3
Pb
 
2
(SO
 
4
)
 
3
Cl
26.26Mammothite
Pb
 
6
Cu
 
4
AlSb
5+
 
O
 
2
(OH)
 
16
Cl
 
4
(SO
 
4
)
 
2
26.27Atlasovite
K(BiO)Cu
 
6
Fe
3+
 
(SO
 
4
)
 
5
O
 
3
Cl
26.28Xitieshanite
Fe
3+
 
(SO
 
4
)Cl · 6H
 
2
O
26.29Nabokoite
KCu
 
7
(SO
 
4
)
 
5
(Te
4+
 
O
 
3
)OCl

Other Names for Schairerite

Other Languages:
German:Schairerit
Russian:Шайрерит
Spanish:Schairerita

Other Information

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

References for Schairerite

Reference List:

- +
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 Schairerite

Search Engines:
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  • External Links:
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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Schairerite details from Handbook of Mineralogy (PDF)
  • Mineral Dealers:
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  • Localities for Schairerite

    The 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.
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    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
     
    • 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.
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    Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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