Natrofairchildite Mineral Data

General Natrofairchildite Information

Chemical Formula:

Na2Ca(CO3)2

Composition:

Molecular Weight = 206.08 gm

Sodium 22.31 % Na 30.08 % Na₂O

Calcium 19.45 % Ca 27.21 % CaO

Carbon 11.66 % C 42.71 % CO₂

Oxygen 46.58 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Na₂Ca(CO₃)₂

Environment:

Found in burbankite-calcite veins. Nyerereite (1968) has priority over natrofairchildite (1971) even though the 1968 article was just an abstract.

IMA Status:

Approved IMA 1971

Locality:

Vuori-Jarvi massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

Named as the Na analog of fairchildite.

Name Pronunciation:

Natrofairchildite + Pronunciation

Natrofairchildite Crystallography

Axial Ratios:

a:c = 1:2.4982

Cell Dimensions:

a = 5.291, c = 13.218, Z = 2; V = 320.46 Den(Calc)= 2.14

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/I_o): 2.67(1), 2.64(0.9), 6.71(0.6),

Physical Properties of Natrofairchildite

Cleavage:

{0001} Distinct

Color:

White.

Density:

2.541

Diaphaneity:

Transparent

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Fan Shaped - Occurs as radiating crystals shaped like a fan.

Habit:

Platy - Sheet forms (e.g. micas).

Hardness:

2.5 - Finger Nail

Luminescence:

Fluorescent, Short UV=orange, Long UV=orange.

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Natrofairchildite

Dichroism (e):

colorless.

Dichroism (w):

colorless.

Gladstone-Dale:

CI meas= 0.053 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.125 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2299,KPDmeas= 0.1936,KC= 0.2044
Ncalc = 1.44 - 1.52

Optical Data:

Uniaxial (-), e=1.459, w=1.525, bire=0.0660.

Calculated Properties of Natrofairchildite

Electron Density:

Bulk Density (Electron Density)=2.52 gm/cc
note: Specific Gravity of Natrofairchildite =2.54 gm/cc.

Fermion Index:

Fermion Index = 0.0017684043
Boson Index = 0.9982315957

Photoelectric:

PE_{Natrofairchildite}= 2.90 barns/electron
U=PE_{Natrofairchildite} x rElectron Density= 7.29 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Natrofairchildite is Not Radioactive

Natrofairchildite Classification

Dana Class:

14.03.05.01 (14)Anhydrous Carbonates

(14.03)with Compound Formula A+2 B++ (CO3)2

(14.03.05)Dana Group

14.03.05.01 Natrofairchildite Na2Ca(CO3)2 P 6₃/mmc 6/m 2/m 2/m

Strunz Class:

05.AC.10 05 - CARBONATES (NITRATES)

05.A - Carbonates without additional anions, without H2O

05.AC -Alkali and alkali-earth carbonates

05.AC.10 Nyerereite Na2Ca(CO3)2 C mc2₁ mm2

05.AC.10 Natrofairchildite Na2Ca(CO3)2 P 6₃/mmc 6/m 2/m 2/m

05.AC.10 Zemkorite (Na,K)2Ca(CO3)2 P 6₃/mmc, P 6₃mc, P 6₂c- Hex

Other Natrofairchildite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Natrofairchildite :
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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Print or Cut-and-Paste your Natrofairchildite Specimen Label here :

Natrofairchildite

Na2Ca(CO3)2
Dana No: 14.03.05.01 Strunz No: 05.AC.10
Locality:

Notes:

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