Mineralogy Database

Fairchildite Mineral Data

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General Fairchildite Information

Help on Chemical  Formula: Chemical Formula: K2Ca(CO3)2
Help on Composition: Composition: Molecular Weight = 238.29 gm
   Potassium  32.82 %  K    39.53 % K2O
   Calcium    16.82 %  Ca   23.53 % CaO
   Carbon     10.08 %  C    36.94 % CO2
   Oxygen     40.29 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: K2Ca(CO3)2
Help on Environment: Environment: Dimorph with butschliite. The samples are fused wood-ash clinkers that occurs in partly burned fir and hemlock trees in many national parks and forest in the western United States.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1949
Help on Locality: Locality: Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after John Gifford Fairchild (1882-1965), analytical chemist at the U. S. Geological Survey.
Help on Name Pronunciation: Name Pronunciation: Fairchildite + Pronunciation Say FAIRCHILDITE
Help on Synonym: Synonym: ICSD 100845
  PDF 21-1287

Fairchildite Image

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Comments: PPL thin-section image of fused wood-ash stone, showing slightly altered lath-shaped cross-sections of fairchildite in a fine groundmass containing buetschliite and calcite. Inset image shows sample.
Location: Kaniksu National Forest, Idaho. (AmMin, v32:607). Scale: Thin Section 30 X.
© American Mineralogist

Fairchildite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:2.51896
Help on Cell Dimensions: Cell Dimensions: a = 5.272, c = 13.28, Z = 2; V = 319.65 Den(Calc)= 2.48
Help on Crystal System: Crystal System: Hexagonal - Dihexagonal Dipyramidal H-M Symbol (6/m 2/m 2/m) Space Group: P 63/mmc
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.19(1), 2.64(0.8), 6.64(0.5),

Physical Properties of Fairchildite

Help on Cleavage: Cleavage: {0001} Good
Help on Color: Color: Colorless.
Help on Density: Density: 2.446
Help on Diaphaneity: Diaphaneity: Transparent
Help on Habit: Habit: Platy - Sheet forms (e.g. micas).
Help on Hardness: Hardness: 2.5 - Finger Nail
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Fairchildite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.008 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.006 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2036,KPDmeas= 0.2065,KC= 0.2048
Ncalc = 1.5 - 1.51
Help on Optical Data: Optical Data: Uniaxial (-), e=1.478, w=1.532, bire=0.0540.

Calculated Properties of Fairchildite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.46 gm/cc
note: Specific Gravity of Fairchildite =2.48 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0015686955
Boson Index = 0.9984313045
Help on Photoelectric: Photoelectric: PEFairchildite = 5.47 barns/electron
U=PEFairchildite x relectron= 13.44 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 468.92 (Gamma Ray American Petroleum Institute Units)
Concentration of Fairchildite per GRapi unit = 0.21 (%)

Estimated Radioactivity from Fairchildite - barely detectable


Fairchildite Classification

Help on  Dana Class: Dana Class: (14)Anhydrous Carbonates
  (14.03)with Compound Formula A+2 B++ (CO3)2
  (14.03.03)Fairchildite Series Fairchildite K2Ca(CO3)2 P 63/mmc 6/m 2/m 2/m Zemkorite (Na,K)2Ca(CO3)2 P 63/mmc, P 63mc, P 62c- Hex
Help on  Strunz Class: Strunz Class: 05.AC.20 05 - CARBONATES (NITRATES)
  05.A - Carbonates without additional anions, without H2O
  05.AC -Alkali and alkali-earth carbonates
05.AC.20 Fairchildite K2Ca(CO3)2 P 63/mmc 6/m 2/m 2/m

Other Fairchildite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Fairchildite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: Strunz No: 05.AC.20





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