Neighborite Mineral Data

Neighborite Mineral Data +

General Neighborite Information

Chemical Formula:

NaMgF3

Composition:

Molecular Weight = 104.29 gm

Sodium 22.04 % Na 29.71 % Na₂O

Magnesium 23.31 % Mg 38.65 % MgO

Fluorine 54.65 % F 54.65 % F

- % F -23.01 % -O=F₂

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

NaMgF₃

Environment:

Found in a drill core penetration of the Eocene Green River Formation.

IMA Status:

Approved IMA 1961

Locality:

South Ouray, Uintah County, Utah, USA. Link to MinDat.org Location Data.

Name Origin:

Named for Frank Neighbor (1906-), American petroleum geologist, Sun Oil Co. who logged the first specimen.

Synonym:

ICSD 75291

PDF 13-303

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Neighborite Crystallography

Axial Ratios:

a:b:c =0.6986:1:0.7169

Cell Dimensions:

a = 5.363, b = 7.676, c = 5.503, Z = 4; V = 226.54 Den(Calc)= 3.06

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pcmn

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 1.918(1), 2.71(0.5), 3.83(0.35),

Crystal Structure:

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Zhao Y S , Parise J B , Wang Y , Kusaba K , Vaughan M T , Weidner D J , Kikegawa T , Chen J , Shimomura O , American Mineralogist , 79 (1994) p.615-621, High-pressure crystal chemistry of neighborite, NaMgF3: an angle-dispersive, diffraction study using monochromatic synchrotron X-radiation, P = room pressure

View Additional jPOWD Structure files for Neighborite
[1] [10] [11] [12] [13] [14] [15] [2] [3] [4] [5] [6] [7] [8] [9]

Physical Properties of Neighborite

Cleavage:

[???] Indistinct

Color:

Colorless, Pink, Reddish brown.

Density:

3.03

Diaphaniety:

Transparent to Translucent

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Habit:

Octahedral Crystals - Occurs as octahedral shaped crystals.

Hardness:

4.5 - Between Fluorite and Apatite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Neighborite

Gladstone-Dale:

CI meas= 0.243 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.251 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1194,KPDmeas= 0.1206,KC= 0.1594

Optical Data:

Biaxial (?), a=1.364, g=1.367, bire=0.0030

Calculated Properties of Neighborite

Electron Density:

r_electron=2.91 gm/cc
note: r_Neighborite=3.03 gm/cc.

Fermion Index

Fermion Index = 0.0233
Boson Index = 0.9767

Photoelectric:

PE_Neighborite= 1.14 barns/electron
U=PE_Neighborite x r_electron= 3.30 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Neighborite is Not Radioactive

Neighborite Classification

Dana Class:

11.1.1.1 (11)Halide Complexes; Alumino-fluorides

(11.1)where (A)m B (X)3

(11.1.1)Dana Group

11.1.1.1 Neighborite NaMgF3 Pcmn 2/m 2/m 2/m

Strunz Class:

III/C.03-70 III - Halogenides

III/C - Double halogenides with water, Fluorides

III/C.03 - Prosopite - Boldyrevite series

III/C.03-10 Prosopite CaAL2(F,OH)8 A2/a 2/m

III/C.03-20 Chiolite Na5Al3F14 P 4/mnc 4/m 2/m 2/m

III/C.03-30 Weberite Na2MgAlF7 I mma 2/m 2/m 2/m

III/C.03-40 Usovite Ba2CaMgAl2F14 C 2/c or Cc Mono

III/C.03-45 Karasugite SrCaAl(F,OH)7 P 2₁/c 2/m

III/C.03-50 Carlhintzeite Ca2AlF7·(H2O) C1,C1 Tri

III/C.03-55 Rosenbergite AlF3·3(H2O) P 4/n 4/m

III/C.03-60 Ralstonite NaxMgxAl2-x(F,OH)6·(H2O) F d3m 4/m 3 2/m

III/C.03-70 Neighborite NaMgF3 Pcmn 2/m 2/m 2/m

III/C.03-80 Boldyrevite* NaCaMgAl3F14·4(H2O) None

Other Neighborite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Neighborite :
1 - Alkali-Nuts(English) 2 - Alkali-Nuts(Francais) 3 -Am. Min. Crystal Structure Database 4 -Athena 5 - EUROmin Project 6 -Google Images 7 -Google Scholar 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 - WWW-MINCRYST 14 -École des Mines de Paris

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Neighborite

NaMgF3
Dana No: 11.1.1.1 Strunz No: III/C.03-70
Locality:

Notes: