Brunogeierite Mineral Data

Brunogeierite Mineral Data +

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General Brunogeierite Information

Chemical Formula:

(Ge++,Fe++)Fe+++2O4

Composition:

Molecular Weight = 244.11 gm

Iron 51.47 % Fe 7.36 % FeO / 65.42 % Fe₂O₃

Germanium 22.31 % Ge 32.14 % GeO₂

Oxygen 26.22 % O

______ ______

100.00 % 104.92 % = TOTAL OXIDE

Empirical Formula:

Ge_0.75Fe²⁺_0.25Fe³⁺₂O₄

Environment:

In the lower oxidation zone of a dolostone-hosted hydrothermal polymetallic ore deposit, at a depth of 930 meters. Encrusting tennantite and inclusions in sphalerite and magnetite.

IMA Status:

Approved IMA 1972

Locality:

From Tsumeb, Namibia. Link to MinDat.org Location Data.

Name Origin:

For Dr. Bruno H. Geier (1902- ), formerly Chief Mineralogist, Tsumeb Corporation, Tsumeb, Namibia.

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Brunogeierite Crystallography

Cell Dimensions:

a = 8.409, Z = 8; V = 594.61 Den(Calc)= 5.45

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): 2.54(1), 1.484(0.9), 1.615(0.7),

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Crystal Structure:

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Welch M D , Cooper M A , Hawthorne F C , Mineralogical Magazine , 65 (2001) p.441-444, The crystal structure of brunogeierite, Fe2GeO4 spinel, Locality: Tsumeb, Namibia

Physical Properties of Brunogeierite

Color:

Gray, Black.

Density:

5.51

Diaphaniety:

Opaque

Habit:

Encrustations - Forms crust-like aggregates on matrix.

Hardness:

4.5 - Between Fluorite and Apatite

Luster:

Sub Metallic

Optical Properties of Brunogeierite

Optical Data:

NCalc= 2.42 - from Gladstone-Dale relationship (KC = 0.2597) where Ncalc=Dcalc*KC+1
NCalc= 2.43 - from Gladstone-Dale relationship (KC = 0.2597) where Ncalc=Dmeas*KC+1

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Brunogeierite in Air**
λ	R	∑ R(λ)
400 nm	15.50
420 nm	15.00
440 nm	14.50
460 nm	14.10
480 nm	13.80
500 nm	13.60
520 nm	13.40
540 nm	13.30
560 nm	13.20
580 nm	13.10
600 nm	13.00
620 nm	13.00
640 nm	12.90
660 nm	12.80
680 nm	12.80
700 nm	12.80

**Calculated Relative Intensity Colors of Brunogeierite in Air**
Relative Intensity	0%	70%	100%	140%	210%	280%	350%	420%	490%	560%	630%	670%
R

Calculated Properties of Brunogeierite

Electron Density:

r_electron=5.11 gm/cc
note: r_{Brunogeierite}=5.45 gm/cc.

Fermion Index

Fermion Index = 0.02843
Boson Index = 0.97157

Photoelectric:

PE_{Brunogeierite}= 29.72 barns/electron
U=PE_{Brunogeierite} x r_electron= 151.93 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Brunogeierite is Not Radioactive

Brunogeierite Classification

Dana Class:

7.2.2.7 (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.04-50 IV - Oxides

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

IV/B.04 - Spinel group, Vuorelainenite - Brunogeierite series

IV/B.04-05 Magnesiocoulsonite MgV2O4 F d3m 4/m 3 2/m

IV/B.04-10 Vuorelainenite (Mn,Fe)(V,Cr)2O4 F d3m 4/m 3 2/m

IV/B.04-20 Coulsonite FeV2O4 F d3m 4/m 3 2/m

IV/B.04-30 Qandilite (Mg,Fe)2(Ti,Fe,Al)O4 F d3m 4/m 3 2/m

IV/B.04-40 Ulvospinel TiFe2O4 F d3m 4/m 3 2/m

IV/B.04-50 Brunogeierite (Ge,Fe)Fe2O4 F d3m 4/m 3 2/m

Other Brunogeierite Information

References:

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

See Also:

Links to other databases for Brunogeierite :
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 - WWW-MINCRYST 13 -École des Mines de Paris

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Brunogeierite

(Ge++,Fe++)Fe+++2O4
Dana No: 7.2.2.7 Strunz No: IV/B.04-50
Locality:

Notes: