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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Physical Properties of Brunogeierite
Color:
Gray, Black.
Density:
5.51
Diaphaneity:
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= 2.49 - from Gladstone-Dale relationship (KC = 0.2736) where Ncalc=Dcalc*KC+1 NCalc= 2.51 - from Gladstone-Dale relationship (KC = 0.2736) 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:
Bulk Density (Electron Density)=5.11 gm/cc note: Specific Gravity of Brunogeierite =5.45 gm/cc.
Fermion Index:
Fermion Index = 0.02 Boson Index = 0.98
Photoelectric:
PEBrunogeierite = 29.72 barns/electron U=PEBrunogeierite x rElectron Density= 151.93 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Brunogeierite is Not Radioactive
Chemical Formula: 
