Mineralogy Database

Maldonite Mineral Data

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General Maldonite Information

Help on Chemical  Formula: Chemical Formula: Au2Bi
Help on Composition: Composition: Molecular Weight = 602.91 gm
   Bismuth  34.66 %  Bi
   Gold     65.34 %  Au
           100.00 % 
Help on Empirical Formula: Empirical Formula: Au2Bi
Help on Environment: Environment: Found in gold-quartz veins, probable high temperature mineral. Intergrown with gold and bismuth.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1870
Help on Locality: Locality: Nugget reef, near Maldon, Victoria, Australia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Name Pronunciation: Name Pronunciation: Maldonite + Pronunciation Say MALDONITE

Maldonite Image

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Comments: PPL polished section showing maldonite grain associated with native bismuth (Bi) and exsolved bismuth-gold areas..
Location: Escanaba Trough at the southern end of the Gorda Ridge. (Geology, v36:815). Scale: See Image.
© Geology

Maldonite Crystallography

Help on Cell Dimensions: Cell Dimensions: a = 7.958, Z = 8; V = 503.98 Den(Calc)= 15.89
Help on Crystal System: Crystal System: Isometric - Hexoctahedral H-M Symbol (4/m 3 2/m) Space Group: F d3m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.41(1), 1.537(0.6), 2.3(0.5),

Physical Properties of Maldonite

Help on Cleavage: Cleavage: {001} Distinct, {110} Distinct
Help on Color: Color: Copper red, Reddish white, Black, Silver white.
Help on Density: Density: 15.46
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Sectile - Curved shavings or scrapings produced by a knife blade, (e.g. graphite).
Help on Habit: Habit: Massive - Granular - Common texture observed in granite and other igneous rock.
Help on Habit: Habit: Octahedral Crystals - Occurs as octahedral shaped crystals.
Help on Hardness: Hardness: 1.5-2 - Talc-Gypsum
Help on Luster: Luster: Metallic

Optical Properties of Maldonite

Help on RL Color: RL Color: Silver white with a pint tinge..
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Maldonite in Air
λ R  ∑ R(λ) 
 400 nm   47.00   
 420 nm   48.60 
 440 nm   50.20 
 460 nm   51.60 
 480 nm   52.80 
 500 nm   54.00 
 520 nm   55.00 
 540 nm   55.80 
 560 nm   56.50 
 580 nm   56.90 
 600 nm   57.30 
 620 nm   57.40 
 640 nm   57.50 
 660 nm   57.70 
 680 nm   58.10 
 700 nm   58.60 
Calculated Relative Intensity Colors of Maldonite in Air
   0%   20%   40%   60%   80% 100% 120% 140% 160% 180%

Calculated Properties of Maldonite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=12.7 gm/cc
note: Specific Gravity of Maldonite =15.9 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 3.4661756E-7
Boson Index = 0.9999996534
Help on Photoelectric: Photoelectric: PEMaldonite =1,809.55 barns/electron
U=PEMaldonite x rElectron Density=22987.22 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Maldonite is Not Radioactive

Maldonite Classification

Help on  Dana Class: Dana Class: (01)Native Elements
  (01.01)with metallic elements other than the platinum group
  (01.01.03)Dana Group Maldonite Au2Bi F d3m 4/m 3 2/m
Help on  Strunz Class: Strunz Class: 02.AA.40 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf
  02.A - Simple Sulfides, Selenides, etc
  02.AA -Alloys of metalloids with Cu, Ag, Sn, Au
02.AA.40 Maldonite Au2Bi F d3m 4/m 3 2/m

Other Maldonite Information

Help on References: References: NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)
Help on See Also: See Also: Links to other databases for Maldonite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: Strunz No: 02.AA.40





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