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Fairchildite

Collectors Summary

Color farblos
Streak color weiß
Solubility ++ H2O, an feuchter Luft -> Buetschliit
Crystal System hexagonal, P63/mmc

Chemism

Chem­ical formula

K2Ca(CO3)2

Chem­ical com­po­si­tion

Calcium, Kalium, Kohlenstoff, Sauerstoff

Unit weight: 238.29316 u; Number of atoms in the formula: 11

Info

Empirical formula:

K2Ca(CO3)2

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Carbon

C

10.08

2

18.18

12.0107800

24.0215600

Oxygen

O

40.29

6

54.55

15.9994300

95.9965800

Potassium

K

32.82

2

18.18

39.0983100

78.1966200

Calcium

Ca

16.82

1

9.09

40.0784000

40.0784000

Anal­y­sis wt%

K2O : 39.53, CaO : 23.53, CO2 : 36.94 (Ref: berechnet)

Strunz 9th edi­tion incl. updates

5.AC.20

5: Carbonate (Carbonate, Nitrate)
A: Carbonate ohne weitere Anionen, ohne H2O
C: Alkali- und Alkali-Erden-Carbonate
20:Fairchildit-Gruppe

Lapis Clas­sifica­tion

V/B.05-050

V: NITRATE, CARBONATE UND BORATE
B: Wasserfreie Carbonate [CO3] 2-, ohne fremde Anionen

Clas­sifica­tion by Hölzel

5.AB.330

5: CARBONATES NITRATES ARSENITES SULFITES SELENITES TELLURITES IODATES
A: Carbonates (-Anions -Water)
B: Carbonates: hexagonal or trigonal
3: Other Double Carbonates

Dana 8th edi­tion

14.03.03.01

14: Anhydrous Carbonates
03: Anhydrous Carbonates with Compound Formula A+2 B++ (CO3)2
03: Fairchildite Series

IMA sta­tus

Erstbeschreibung vor CNMNC-Gründung (1959), als Mineral meist anerkannt

Min­eral sta­tus

anerkanntes Mineral

Optical Properties

Color

farblos

Streak color

weiß

max. Birefrin­gence

0.046

Birefringence chart\! Fairchildite title=Birefringence chart Fairchildite

Michel-Levy Color Chart viewed according to the maximum birefringence (at 30μm). Mineral color is not taken into account. Click on the image to enlarge or change thickness.

RI value α / ω / n

1.532

RI value γ / ε

1.478

Ri mean

1.514

2V angle

Uniaxial (-)

Crystallography

Crystal Sys­tem

hexagonal

Class (H-M)

6/mmm

Space Group number

194

Space Group

P63/mmc

Cell param­e­ters a (Å)

5.272

Cell param­e­ters b (Å)

-

Cell param­e­ters c (Å)

13.280

Cell param­e­ters a/b or c/a

2.519

Cell param­e­ters c/b

-

Cell param­e­ters α

90°

Cell param­e­ters β

90°

Cell param­e­ters γ

120°

Z

2

Volumne (ų)

319.654

X-Ray Pow­der Diffrac­tion

6.68(50),
4.56(40),
3.20(100),
2.707(40),
2.644(70),
2.232(30),
2.168(40),
2.032(30)

XRD chart Fairchildite

Calculated from d-spacing and intensity at 0.1541838 nm (Cu)

Crystal Structure 3D

Open larger view

Physical Properties

Density (g/cm³)

2.45 gem. und ber.

2.476 ( ρ calc. Mineralienatlas )

Insta­bil­ity

++ H2O, an feuchter Luft -> Buetschliit

Preface

Name from

John Gifford Fairchild (1882-1965), analytischer Chemiker des U.S. Geological Survey

Author (Name, Year)

Milton & Axelrod, 1947

References

Milton, C., Axelrod, J. American Mineralogist 32 (1947), 607-624.

Other languages

German

Fairchildit

Spanish

Fairchildita

English

Fairchildite

French

Fairchildite

Russian

Файчильдит

CNMNC symbol

Symbol

Fch

Automatic Links to external internet sources (Responsibility is with the operator)

German pages

DeWikiPedia - search for: Fairchildit
Google-Bilder-Suche - search for: Fairchildit
Mineralienatlas.de (Forum) - search for: Fairchildit

English pages

Mindat - search for: Fairchildite
Webmineral - search for:Fairchildite
Handbook-of-Mineralogy - search for: Fairchildite
RRUFF - Raman, XRD and other mineral data - search for: Fairchildite
RRUFF - References and PDF downloads - search for: Fairchildite
American-Mineralogist-Crystal-Structure-Database - search for: Fairchildite
Strahlen.org - search for: Fairchildite

Russian pages

Webmineral.ru - search for: Файчильдит

Mineral Dealer

German pages

hausen - Mineralgroßhandel - search for: Fairchildit
Crystal-Treasure.com - search for: Fairchildit
Bosse - search for: Fairchildit
Edelsteine Neuburg - Gundolf Fischer - search for: Fairchildit

Locations with GPS information