Galaxite Mineral Data

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General Galaxite Information

Chemical Formula:

(Mn,Mg)(Al,Fe+++)2O4

Composition:

Molecular Weight = 172.72 gm

Magnesium 1.41 % Mg 2.33 % MgO

Manganese 28.63 % Mn 36.96 % MnO

Aluminum 29.68 % Al 56.08 % Al₂O₃

Iron 3.23 % Fe 4.62 % Fe₂O₃

Oxygen 37.05 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mn²⁺_0.9Mg_0.1Al_1.9Fe³⁺_0.1O₄

Environment:

In carbonate-rich, silica undersaturated parts of metamorphosed manganese deposit.

IMA Status:

Valid Species (Pre-IMA) 1932

Locality:

Bald Knob near the town of Galax, Alleghany co., North Carolina, USA. Link to MinDat.org Location Data.

Name Origin:

Named after its location.

Name Pronunciation:

Galaxite

Synonym:

ICSD 66855

PDF 29-880

Galaxite Image

Images:

Galaxite Alleghanyite

Comments: Black granular galaxite with reddish alleghanyite and white kutnohorite.
Location: Bald Knob, Alleghany County, North Carolina, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Galaxite Crystallography

Cell Dimensions:

a = 8.271, Z = 8; V = 565.81 Den(Calc)= 4.05

Crystal System:

Isometric - HexoctahedralH-M Symbol (4/m 3 2/m) Space Group: F d3m

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

By Intensity(I/I_o): 2.492(1), 2.921(0.6), 1.46(0.45),

Forms:

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Forms: ( 0 1 1) ( 1 1 1)

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Crystal Structure:

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Essene E J , Peacor D R , American Mineralogist , 68 (1983) p.449-455, Crystal chemistry and petrology of coexisting galaxite and jacobsite and other, spinel solution and solvi

View Additional jPOWD Structure files for Galaxite
[1]

Physical Properties of Galaxite

Cleavage:

{???} Indistinct

Color:

Brown red, Black.

Density:

4.23

Diaphaneity:

Opaque

Fracture:

Conchoidal - Uneven - Uneven fracture producing small, conchoidal fragments.

Habit:

Granular - Generally occurs as anhedral to subhedral crystals in matrix.

Hardness:

7.5 - Garnet

Luminescence:

Non-fluorescent.

Luster:

Metallic

Streak:

brownish red

Optical Properties of Galaxite

Gladstone-Dale:

CI meas= -0.048 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.095 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2279,KPDmeas= 0.2182,KC= 0.2081
Ncalc = 1.84 - 1.88

Optical Data:

Isotropic, n=1.923.

Calculated Properties of Galaxite

Electron Density:

Bulk Density (Electron Density)=4.07 gm/cc
note: Specific Gravity of Galaxite =4.23 gm/cc.

Fermion Index:

Fermion Index = 0.0022704957
Boson Index = 0.9977295043

Photoelectric:

PE_Galaxite= 9.24 barns/electron
U=PE_Galaxite x rElectron Density= 37.56 barns/cc.

Radioactivity:

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

Galaxite Classification

Dana Class:

07.02.01.02 (07)Multiple Oxides

(07.02)(A+ B++)2 X4 Spinel group

(07.02.01)(Aluminum subgroup)

07.02.01.01 Spinel MgAl2O4 F d3m 4/m 3 2/m

07.02.01.02 Galaxite (Mn,Mg)(Al,Fe)2O4 F d3m 4/m 3 2/m

07.02.01.03 Hercynite FeAl2O4 F d3m 4/m 3 2/m

07.02.01.04 Gahnite ZnAl2O4 F d3m 4/m 3 2/m

Strunz Class:

04.BB.05 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate

04.B - Metal:Oxygen = 3:4 and similar

04.BB -With only medium-sized cations

04.BB.05 Cochromite (Co,Ni,Fe)(Cr,Al)2O4 F d3m 4/m 3 2/m

04.BB.05 Filipstadite (Mn,Mg)4SbFeO8 pseudo ISO 2/m 2/m 2/m

04.BB.05 Magnetite FeFe2O4 F d3m 4/m 3 2/m

04.BB.05 Gahnite ZnAl2O4 F d3m 4/m 3 2/m

04.BB.05 Chromite FeCr2O4 F d3m 4/m 3 2/m

04.BB.05 Galaxite (Mn,Mg)(Al,Fe)2O4 F d3m 4/m 3 2/m

04.BB.05 Cuprospinel (Cu,Mg)Fe2O4 F d3m 4/m 3 2/m

04.BB.05 Donathite? (Fe,Mg)(Cr,Fe)2O4 P 4/nnm 4/m 2/m 2/m

04.BB.05 Brunogeierite (Ge,Fe)Fe2O4 F d3m 4/m 3 2/m

04.BB.05 Coulsonite FeV2O4 F d3m 4/m 3 2/m

04.BB.05 Hercynite FeAl2O4 F d3m 4/m 3 2/m

04.BB.05 Franklinite (Zn,Mn,Fe)(Fe,Mn)2O4 F d3m 4/m 3 2/m

04.BB.05 Jacobsite (Mn,Fe,Mg)(Fe,Mn)2O4 F d3m 4/m 3 2/m

04.BB.05 Magnesiochromite MgCr2O4 F d3m 4/m 3 2/m

04.BB.05 Magnesioferrite MgFe2O4 F d3m 4/m 3 2/m

04.BB.05 Magnesiocoulsonite MgV2O4 F d3m 4/m 3 2/m

04.BB.05 Manganochromite (Mn,Fe)(Cr,V)2O4 F d3m 4/m 3 2/m

04.BB.05 Qandilite (Mg,Fe)2(Ti,Fe,Al)O4 F d3m 4/m 3 2/m

04.BB.05 Nichromite (Ni,Co,Fe)(Cr,Fe,Al)2O4 F d3m 4/m 3 2/m

04.BB.05 Spinel MgAl2O4 F d3m 4/m 3 2/m

04.BB.05 Ulvospinel TiFe2O4 F d3m 4/m 3 2/m

04.BB.05 Zincochromite ZnCr2O4 F d3m 4/m 3 2/m

04.BB.05 Trevorite NiFe2O4 F d3m 4/m 3 2/m

04.BB.05 Vuorelainenite (Mn,Fe)(V,Cr)2O4 F d3m 4/m 3 2/m

Other Galaxite Information

References:

NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic3)

See Also:

Links to other databases for Galaxite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - MinMax(Deutsch)
11 - MinMax(English)
12 - Mineral and Gemstone Kingdom
13 - Mineralienatlas (Deutsch)
14 - QUT Mineral Atlas
15 - Ruff.Info
16 - WWW-MINCRYST

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

Galaxite

(Mn,Mg)(Al,Fe+++)2O4
Dana No: 07.02.01.02 Strunz No: 04.BB.05
Locality:

Notes: