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Fairchildite

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08251580015742130515251.jpg
John Gifford Fairchild
Formula:
K2Ca(CO3)2
Colour:
Colorless, light gray to bluish gray
Hardness:
Specific Gravity:
2.45 (Calculated)
Crystal System:
Hexagonal
Name:
Named in honor of John Gifford Fairchild (28 May 1882, Monticello, New York, USA - 16 January 1965, Alexandria, Virginia, USA), analytical chemist, with 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)
First Published:
1947
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.

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0010845FairchilditePertlik F (1981) Structural investigations of synthetic fairchildite, K2Ca(CO3)2 Zeitschrift fur Kristallographie 157 199-2051981synthetic0293
CIF Raw Data - click here to close

Geological EnvironmentHide

Geological Setting:
In clinkers in partly burned softwood trees such as hemlock and fir.

Type Occurrence of FairchilditeHide

Place of Conservation of Type Material:
Smithsonian 105675, 105676, 162622
Geological Setting of Type Material:
Trees struck by lightning
Reference:
Milton, C., Axelrod, J. (1947) Fused wood-ash stones: Fairchildite K2CO3·CaCO3, buetschliite 3K2CO3·2CaCO3·6H2O and calcite, CaCO3, their essential components. American Mineralogist: 32: 607-624.

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, C., Axelrod, J. (1947) Fused wood-ash stones: Fairchildite K2CO3·CaCO3, buetschliite 3K2CO3·2CaCO3·6H2O and calcite, CaCO3, their essential components. American Mineralogist: 32: 607-624.
Fleischer, M. (1948) New mineral names. American Mineralogist: 33: 384-386.
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.
Mandarino, J.A., Harris, D.C. (1965) New Canadian mineral occurrences: I. Eucryptite, pollucite, rozenite, epsomite, dawsonite, fairchildite and butschliite. The Canadian Mineralogist: 8: 377-381.
Fleischer, M. (1967) New mineral names. American Mineralogist: 52: 925-929.
Pertlik, F. (1981) Structural investigations of synthetic fairchildite, K2Ca(CO3)2. Zeitschrift für Kristallographie: 157: 199-205.
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.

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
 
  • Northwest Territories
    • Lac de Gras
      • Ekati Mine
Kamenetsky, V. S., Grütter, H., Kamenetsky, M. B., & Gömann, K. (2013). Parental carbonatitic melt of the Koala kimberlite (Canada): constraints from melt inclusions in olivine and Cr-spinel, and groundmass carbonate. Chemical Geology, 353, 96-111.
  • Ontario
    • Lennox and Addington County
      • Richmond Township
Dawson,K.R. and Sabina,A. (1957) A Canadian occurrence of Fairchildite and Buetschliite, CM6,290
    • Renfrew County
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.
Chile
 
  • Antofagasta
Aguilera, F., Layana, S., Rodríguez-Díaz, A., González, C., Cortés, J., & Inostroza, M. (2016). Alteración hidrotermal, depósitos fumarólicos y fluidos del Complejo Volcánico Lastarria: Un estudio multidsciplinario. Andean geology, 43(2), 166-196.
Germany
 
  • Rhineland-Palatinate
    • Rhein-Lahn District
      • Loreley
        • 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
    • Frances Baard
      • Sol Plaatje
        • 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.
Syria
 
  • As-Suwayda Governorate
Mahfoud, R. F., & Beck, J. N. (1995). Petrogenesis and geodynamic significance of ultramafic inclusions and basanite from southern Syria. International Geology Review, 37(5), 448-470. Mahfoud, R. F., & Beck, J. N. (1995). Composition, origin, and classification of extrusive carbonatites in rifted southern Syria. International Geology Review, 37(4), 361-378.
USA
 
  • Arizona
    • Coconino County
      • Grand Canyon
        • Point Sublime (Sublime Point)
          • Kanabownits Canyon
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
 
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