Natrofairchildite Mineral Data

Natrofairchildite Mineral Data +

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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. Possible trimorphous with nyerereite and zemkorite.

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.

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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 DipyramidalH-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

Diaphaniety:

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

Optical Data:

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

Calculated Properties of Natrofairchildite

Electron Density:

r_electron=2.52 gm/cc
note: r_{Natrofairchildite}=2.54 gm/cc.

Fermion Index

Fermion Index = 0.00176
Boson Index = 0.99824

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Natrofairchildite is Not Radioactive

Natrofairchildite Classification

Dana Class:

14.3.5.1 (14)Anhydrous Carbonates

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

(14.3.5)Dana Group

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

Strunz Class:

V/B.05-30 V - Nitrates, Carbonates and Borates

V/B - Waterfree carbonates [CO3]2- without unfamiliar anions

V/B.05 - Eitelie - Shortite - Carbocernaite series

V/B.05-10 Eitelite Na2Mg(CO3)2 R 3 3

V/B.05-20 Nyerereite Na2Ca(CO3)2 C mc2₁ mm2

V/B.05-30 Natrofairchildite Na2Ca(CO3)2 P 6₃/mmc 6/m 2/m 2/m

V/B.05-40 Gregoryite (Na2,K2,Ca)CO3 P 6₃mc 6mm

V/B.05-50 Fairchildite K2Ca(CO3)2 P 6₃/mmc 6/m 2/m 2/m

V/B.05-55 Zemkorite (Na,K)2Ca(CO3)2 P 6₃/mmc, P 6₃mc, P 6₂c- Hex

V/B.05-60 Butschliite K2Ca(CO3)2 R 3m 3 2/m

V/B.05-70 Shortite Na2Ca2(CO3)3 Amm2 mm2

V/B.05-80 Sahamalite-(Ce) (Mg,Fe)Ce2(CO3)4 P 2₁/a 2/m

V/B.05-90 Remondite-(Ce) Na3(Ce,La,Ca,Na,Sr)3(CO3)5 P 2₁ 2

V/B.05-92 Remondite-(La)! Na3(La,Ce,Ca)3(CO3)5 P 2₁ 2

V/B.05-95 Petersenite-(Ce) (Na,Ca)4(Ce,La,Nd)2(CO3)5 P 2₁ 2

V/B.05-98 Calcioburbankite Na3(Ca,REE,Sr)3(CO3)5 P 6₃mc 6mm

V/B.05-100 Burbankite (Na,Ca)3(Sr,Ba,Ce)3(CO3)5 P 6₃/mmc 6/m 2/m 2/m

V/B.05-110 Khanneshite (NaCa)3(Ba,Sr,Ce,Ca)3(CO3)5 P 6₃mc 6mm

V/B.05-120 Carbocernaite (Ca,Na)(Sr,Ce,Ba)(CO3)2 P mc2₁ mm2

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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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Print or Cut-and-Paste your Natrofairchildite Specimen Label here :

Natrofairchildite

Na2Ca(CO3)2
Dana No: 14.3.5.1 Strunz No: V/B.05-30
Locality:

Notes: