Galaxite Mineral Data

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.

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

Diaphaniety:

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

Optical Data:

Isotropic, n=1.923.

Calculated Properties of Galaxite

Electron Density:

r_electron=4.07 gm/cc
note: r_Galaxite=4.23 gm/cc.

Fermion Index

Fermion Index = 0.00227
Boson Index = 0.99773

Photoelectric:

PE_Galaxite= 9.24 barns/electron
U=PE_Galaxite x r_electron= 37.56 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Galaxite is Not Radioactive

Galaxite Classification

Dana Class:

7.2.1.2 (7)Multiple Oxides

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

(7.2.1)(Aluminum subgroup)

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

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

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

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

Strunz Class:

IV/B.01-30 IV - Oxides

IV/B - Oxides with metal : oxygen = 3:4 (spinel type M3O4 and related), Aluminat-Spinels

IV/B.01 - Spinel group, Spinel - Gahnite series

IV/B.01-10 Spinel MgAl2O4 F d3m 4/m 3 2/m

IV/B.01-20 Hercynite FeAl2O4 F d3m 4/m 3 2/m

IV/B.01-30 Galaxite (Mn,Mg)(Al,Fe)2O4 F d3m 4/m 3 2/m

IV/B.01-40 Gahnite ZnAl2O4 F d3m 4/m 3 2/m

Other Galaxite Information

References:

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

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Galaxite

(Mn,Mg)(Al,Fe+++)2O4
Dana No: 7.2.1.2 Strunz No: IV/B.01-30
Locality:

Notes: