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Maldonite Mineral Data
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General Maldonite Information
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 Chemical Formula: |
Au2Bi |
| Composition: |
Molecular Weight = 602.91 gm |
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Bismuth 34.66 % Bi |
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Gold 65.34 % Au |
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______ |
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100.00 % |
| Empirical Formula: |
Au2Bi |
| Environment: |
Found in gold-quartz veins, probable high temperature mineral. Intergrown with gold and bismuth. |
| IMA Status: |
Valid Species (Pre-IMA) 1870 |
| Locality: |
Nugget reef, near Maldon, Victoria, Australia. Link to MinDat.org Location Data. |
| Name Origin: |
Named for the locality. |
| Name Pronunciation: |
Maldonite + Pronunciation  |
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Maldonite Image |
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Images:
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Maldonite
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 |
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Maldonite Crystallography
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| Cell Dimensions: |
a = 7.958, Z = 8; V = 503.98 Den(Calc)= 15.89 |
| Crystal System: |
Isometric - Hexoctahedral H-M Symbol (4/m 3 2/m) Space Group: F d3m |
| X Ray Diffraction: |
By Intensity(I/Io): 2.41(1), 1.537(0.6), 2.3(0.5), |
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Physical Properties of Maldonite
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| Cleavage: |
{001} Distinct, {110} Distinct |
| Color: |
Copper red, Reddish white, Black, Silver white. |
| Density: |
15.46 |
| Diaphaneity: |
Opaque |
| Fracture: |
Sectile - Curved shavings or scrapings produced by a knife blade, (e.g. graphite). |
| Habit: |
Massive - Granular - Common texture observed in granite and other igneous rock. |
| Habit: |
Octahedral Crystals - Occurs as octahedral shaped crystals. |
| Hardness: |
1.5-2 - Talc-Gypsum |
| Luster: |
Metallic |
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Optical Properties of Maldonite
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| RL Color: |
Silver white with a pint tinge.. |
| Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Maldonite in Air
| λ |
R |
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∑ R(λ) |
| 400 nm |
47.00 |
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| 420 nm |
48.60 |
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| 440 nm |
50.20 |
 |
| 460 nm |
51.60 |
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| 480 nm |
52.80 |
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| 500 nm |
54.00 |
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| 520 nm |
55.00 |
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| 540 nm |
55.80 |
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| 560 nm |
56.50 |
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| 580 nm |
56.90 |
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| 600 nm |
57.30 |
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| 620 nm |
57.40 |
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| 640 nm |
57.50 |
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| 660 nm |
57.70 |
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| 680 nm |
58.10 |
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| 700 nm |
58.60 |
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Calculated Relative Intensity Colors of Maldonite in Air
Relative
Intensity |
0% |
20% |
40% |
60% |
80% |
100% |
120% |
140% |
160% |
180% |
| R |
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Calculated Properties of Maldonite
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| Electron Density: |
Bulk Density (Electron Density)=12.7 gm/cc
note: Specific Gravity of Maldonite =15.9 gm/cc.
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| Fermion Index: |
Fermion Index = 3.4661756E-7
Boson Index = 0.9999996534 |
| Photoelectric: |
PEMaldonite =1,809.55 barns/electron
U=PEMaldonite x rElectron Density=22987.22 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Maldonite is Not Radioactive |
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Maldonite Classification
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| Dana Class: |
01.01.03.01 (01)Native Elements |
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(01.01)with metallic elements other than the platinum group |
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(01.01.03)Dana Group |
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01.01.03.01 Maldonite Au2Bi F d3m 4/m 3 2/m |
| Strunz Class: |
02.AA.40 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf |
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02.A - Simple Sulfides, Selenides, etc |
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02.AA -Alloys of metalloids with Cu, Ag, Sn, Au |
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02.AA.40 Maldonite Au2Bi F d3m 4/m 3 2/m |
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Other Maldonite Information
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| References: |
NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1) |
| 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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Maldonite
Au2Bi
Dana No: 01.01.03.01 Strunz No: 02.AA.40
Locality:
Notes:
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