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Fairchildite

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Formula:
K2Ca(CO3)2
Colour:
Colorless, light gray to bluish gray
Hardness:
Specific Gravity:
2.45 (Calculated)
Crystal System:
Hexagonal
Name:
After John G. Fairchild (1882-1965), analytical chemist, of the U.S. Geological Survey.
Dimorph of:
The K analogue of zemkorite.


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Classification of FairchilditeHide

Approved, 'Grandfathered' (first described prior to 1959)
5.AC.20

5 : CARBONATES (NITRATES)
A : Carbonates without additional anions, without H2O
C : Alkali and alkali-earth carbonates
14.3.3.1

14 : ANHYDROUS NORMAL CARBONATES
3 : A2B(XO3)2
11.1.16

11 : Carbonates
1 : Carbonates of the alkali metals and ammonium

Pronounciation of FairchilditeHide

Pronounciation:
PlayRecorded byCountry
Jolyon & Katya RalphUnited Kingdom

Physical Properties of FairchilditeHide

Transparency:
Transparent
Colour:
Colorless, light gray to bluish gray
Hardness:
2½ on Mohs scale
Cleavage:
Distinct/Good
Good on {0001}.
Density:
2.45 g/cm3 (Calculated)

Optical Data of FairchilditeHide

Type:
Uniaxial (-)
RI values:
nω = 1.533 nε = 1.498
Max Birefringence:
δ = 0.035
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low

Chemical Properties of FairchilditeHide

Formula:
K2Ca(CO3)2

Crystallography of FairchilditeHide

Crystal System:
Hexagonal
Class (H-M):
6/mmm (6/m 2/m 2/m) - Dihexagonal Dipyramidal
Space Group:
P63/mmc
Cell Parameters:
a = 5.294(1) Å, c = 13.355(2) Å
Ratio:
a:c = 1 : 2.523
Unit Cell V:
324.15 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Tiny hexagonal plates flattened on {0001}. In dense stony aggregates.

Type Occurrence of FairchilditeHide

Place of Conservation of Type Material:
Smithsonian 105675, 105676, 162622
Geological Setting of Type Material:
Trees struck by lightning

Other Language Names for FairchilditeHide

Common AssociatesHide

BütschliiteK2Ca(CO3)2
CalciteCaCO3

Related Minerals - Nickel-Strunz GroupingHide

5.AC.05EiteliteNa2Mg(CO3)2Trig.
5.AC.10NyerereiteNa2Ca(CO3)2Orth. mmm (2/m 2/m 2/m) : Cmcm
5.AC.10ZemkoriteNa2Ca(CO3)2Hex.
5.AC.15BütschliiteK2Ca(CO3)2Trig. 3m (3 2/m) : R3m
5.AC.25ShortiteNa2Ca2(CO3)3Orth. mm2 : Amm2
5.AC.30Burbankite(Na,Ca)3(Sr,Ba,Ce)3(CO3)5Hex. 6mm : P63mc
5.AC.30CalcioburbankiteNa3(Ca,REE,Sr)3(CO3)5Hex. 6mm : P63mc
5.AC.30Khanneshite(Na,Ca)3(Ba,Sr,Ce,Ca)3(CO3)5Hex.
5.AC.30SanromániteNa2CaPb3[CO3]5Hex. 6mm : P63mc

Related Minerals - Dana Grouping (8th Ed.)Hide

14.3.3.2ZemkoriteNa2Ca(CO3)2Hex.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

11.1.1ZabuyeliteLi2CO3Mon. 2/m : B2/b
11.1.2NatriteNa2CO3Mon.
11.1.3NahcoliteNaHCO3Mon. 2/m
11.1.4WegscheideriteNa5H3(CO3)4Tric. 1 : P1
11.1.5ThermonatriteNa2CO3 · H2OOrth. mmm (2/m 2/m 2/m) : Pmmm
11.1.6TronaNa3H(CO3)2 · 2H2OMon. 2/m
11.1.7NatronNa2CO3 · 10H2OMon. 2/m : P2/m
11.1.8KaliciniteKHCO3Mon. 2/m
11.1.9ShortiteNa2Ca2(CO3)3Orth. mm2 : Amm2
11.1.10NyerereiteNa2Ca(CO3)2Orth. mmm (2/m 2/m 2/m) : Cmcm
11.1.11NatrofairchilditeNa2Ca(CO3)2Orth.
11.1.12ZemkoriteNa2Ca(CO3)2Hex.
11.1.13PirssoniteNa2Ca(CO3)2 · 2H2OOrth. mm2 : Fdd2
11.1.14GaylussiteNa2Ca(CO3)2 · 5H2OMon. 2/m : B2/b
11.1.15BaylissiteK2Mg(CO3)2 · 4H2OMon.
11.1.17BütschliiteK2Ca(CO3)2Trig. 3m (3 2/m) : R3m
11.1.18Teschemacherite(NH4)HCO3Orth. mmm (2/m 2/m 2/m) : Pccn

Other InformationHide

Special Storage/
Display Requirements:
Slowly hygroscopic in air, altering to Bütschliite, and finally to calcite.
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 FairchilditeHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Milton and Axelrod (1947) American Mineralogist: 32: 607-624.
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: Halides, Nitrates, Borates, Carbonates, Sulfates, Phosphates, Arsenates, Tungstates, Molybdates, Etc. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged: 222.
Zeitschrift für Kristallographie: 157: 199-205.

Internet Links for FairchilditeHide

Localities for FairchilditeHide

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
 
  • Ontario
    • Lennox and Addington Co.
      • Richmond Township
Dawson,K.R. and Sabina,A. (1957) A Canadian occurrence of Fairchildite and Buetschliite, CM6,290
    • Renfrew Co.
Trail,R.J. 1980, Catalogue of Canadian Minerals, GSC Paper 80-18
  • Saskatchewan
Shang, Y. (2000). Mineralogy, lithostratigraphy and geochemistry of North Ingebright Lake, Saskatchewan, Canada. PhD thesis University of Manitoba.
Germany
 
  • Rhineland-Palatinate
    • Lahn valley
      • Bad Ems District
        • Braubach
Schnorrer-Köhler, G. & David, W. (1991): Die Blei- und Silberhütte Braubach und ihre Haldenminerale. Lapis, 16 (1), 38-49; 58 (in German).
Lapis, 16 (1), 38-53+58.
South Africa
 
  • Northern Cape Province
    • Francis Baard District
      • Kimberley
        • KEM JV Mine (Kimberley Ekapa Mining Joint Venture mine; Kimberley Underground mine)
Giuliani, A., Kamenetsky, V. S., Phillips, D., Kendrick, M. A., Wyatt, B. A., & Goemann, K. (2012). Nature of alkali-carbonate fluids in the sub-continental lithospheric mantle. Geology, 40(11), 967-970.
USA
 
  • Arizona
    • Coconino Co.
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 218; Milton, C. (1944), Stones from trees, Scientific Monthly: 59: 421-423; Milton, C. & J. Axelrod (1947), Fused woodash stones: Fairchildite (n.sp.) K2CO3·CaCO3, buetschlite (n.sp.) 3K2CO3·2CacO3·6H2O, and calcite, CaCO3, their essential components, Am.Min.: 32: 607-624; Mrose, M.E., et al (1966), Synthesis and properties of fairchildite and buetschlite: Their relationship in wood-ash stone formations, Geol. Soc. Amer. Spec. Paper 101: 146.
AmMin 32:607
    • Maricopa Co.
Garvie, L.A.J. (2016): Mineralogy of paloverde (Parkinsonia microphylla) tree ash from the Sonoran Desert: A combined field and laboratory study. American Mineralogist: 101 : 1584-1595; http://forum.amiminerals.it/viewtopic.php?f=5&t=12875 (2016
  • Idaho
    • Bonner Co.
      • Kaniksu National Forest
Handbook of Mineralogy - Anthony, Bideaux, Bladh, Nichols
Mineral and/or Locality  
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