Magnesioferrite Mineral Data

Magnesioferrite Mineral Data +

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General Magnesioferrite Information

Chemical Formula:

MgFe+++2O4

Composition:

Molecular Weight = 200.00 gm

Magnesium 12.15 % Mg 20.15 % MgO

Iron 55.85 % Fe 79.85 % Fe₂O₃

Oxygen 32.00 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

MgFe³⁺₂O₄

Environment:

Contact metasomatic.

IMA Status:

Valid Species (Pre-IMA) 1859

Locality:

Vesuvius and Stromboli, Italy. Link to MinDat.org Location Data.

Name Origin:

Named after its chemical composition of magnesium and ferric iron.

Synonym:

Ceylonite

ICSD 49551

Iron-Magnesia Spinel

PDF 36-398

Pleonaste

Magnesioferrite Image

Images:

Click Here for Larger Magnesioferrite Image

Magnesioferrite Diopside

Comments: Very dark brown Magnesioferrite Pleonaste (Iron-Magnesium spinel) with cream colored Calcite and gray green diopside.
Location: Aldan, Gon River, Russia. Scale: 6 x 4.5 cm.
© Fabre Minerals

Images:

Magnesioferrite Bromellite

Comments: A micro, water color, hexagonal or barrel shaped crystal of white bromellite to about 0.3 mm on yellowish calcite with associated black magnesioferrite.
Location: Langban, Varmland, Sweden. Scale: 18x9x10mm.
© Tom Loomis / Dakota Matrix

Magnesioferrite Crystallography

Cell Dimensions:

a = 8.366, Z = 8; V = 585.54 Den(Calc)= 4.54

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): 2.525(1), 2.96(0.4), 1.481(0.35),

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Crystal Structure:

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O Neill H St C , Annersten H , Virgo D , American Mineralogist , 77 (1992) p.725-740, The temperature dependence of the cation distribution in magnesioferrite, (MgFe2O4) from powder XRD structural refinements and Mossbauer spectroscopy, batch 1, anneal T = 400 C using Rietveld method

View Additional jPOWD Structure files for Magnesioferrite
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Physical Properties of Magnesioferrite

Cleavage:

None

Color:

Brownish black, Black.

Density:

4.6 - 4.7, Average = 4.65

Diaphaniety:

Opaque

Fracture:

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

Habit:

Crystalline - Fine - Occurs as well-formed fine sized crystals.

Habit:

Massive - Granular - Common texture observed in granite and other igneous rock.

Hardness:

6-6.5 - Orthoclase-Pyrite

Luminescence:

Non-fluorescent.

Luster:

Metallic

Streak:

dark red

Optical Properties of Magnesioferrite

Gladstone-Dale:

CI meas= -0.017 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.042 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.304,KPDmeas= 0.2968,KC= 0.2918

Optical Data:

Isotropic, n=2.38.

RL Color:

Gray with red internal reflections.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Magnesioferrite in Air**
λ	R	∑ R(λ)
470 nm	18.90
546 nm	18.50
589 nm	18.30
650 nm	17.50

**Calculated Relative Intensity Colors of Magnesioferrite in Air**
Relative Intensity	0%	50%	100%	150%	200%	250%	300%	350%	400%	450%	490%
R

Calculated Properties of Magnesioferrite

Electron Density:

r_electron=4.46 gm/cc
note: r_{Magnesioferrite}=4.65 gm/cc.

Fermion Index

Fermion Index = 0.02414
Boson Index = 0.97586

Photoelectric:

PE_{Magnesioferrite}= 17.20 barns/electron
U=PE_{Magnesioferrite} x r_electron= 76.78 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Magnesioferrite is Not Radioactive

Magnesioferrite Classification

Dana Class:

7.2.2.1 (7)Multiple Oxides

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

(7.2.2)(Iron subgroup)

7.2.2.1 Magnesioferrite MgFe2O4 F d3m 4/m 3 2/m

7.2.2.2 Jacobsite (Mn,Fe,Mg)(Fe,Mn)2O4 F d3m 4/m 3 2/m

7.2.2.3 Magnetite FeFe2O4 F d3m 4/m 3 2/m

7.2.2.4 Franklinite (Zn,Mn,Fe)(Fe,Mn)2O4 F d3m 4/m 3 2/m

7.2.2.5 Trevorite NiFe2O4 F d3m 4/m 3 2/m

7.2.2.6 Cuprospinel (Cu,Mg)Fe2O4 F d3m 4/m 3 2/m

7.2.2.7 Brunogeierite (Ge,Fe)Fe2O4 F d3m 4/m 3 2/m

Strunz Class:

IV/B.02-10 IV - Oxides

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

IV/B.02 - Spinel group, Magnesioferrite - Franklinite series

IV/B.02-10 Magnesioferrite MgFe2O4 F d3m 4/m 3 2/m

IV/B.02-20 Magnetite FeFe2O4 F d3m 4/m 3 2/m

IV/B.02-30 Jacobsite (Mn,Fe,Mg)(Fe,Mn)2O4 F d3m 4/m 3 2/m

IV/B.02-40 Trevorite NiFe2O4 F d3m 4/m 3 2/m

IV/B.02-50 Cuprospinel (Cu,Mg)Fe2O4 F d3m 4/m 3 2/m

IV/B.02-60 Franklinite (Zn,Mn,Fe)(Fe,Mn)2O4 F d3m 4/m 3 2/m

Other Magnesioferrite Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic3)

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

Magnesioferrite

MgFe+++2O4
Dana No: 7.2.2.1 Strunz No: IV/B.02-10
Locality:

Notes: