Maldonite Mineral Data

Maldonite Mineral Data +

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General Maldonite Information

Chemical Formula:

Au2Bi

Composition:

Molecular Weight = 602.91 gm

Bismuth 34.66 % Bi

Gold 65.34 % Au

______

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.

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Maldonite Crystallography

Cell Dimensions:

a = 7.958, Z = 8; V = 503.98 Den(Calc)= 15.89

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): 2.41(1), 1.537(0.6), 2.3(0.5),

Physical Properties of Maldonite

Cleavage:

[001] Distinct, [110] Distinct

Color:

Copper red, Reddish white, Black, Silver white.

Density:

15.46

Diaphaniety:

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

Optical Properties of Maldonite

RL Color:

Silver white with a pint tinge..

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**
Relative Intensity	0%	20%	40%	60%	80%	100%	120%	140%	160%	180%
R

Calculated Properties of Maldonite

Electron Density:

r_electron=12.7 gm/cc
note: r_Maldonite=15.9 gm/cc.

Fermion Index

Fermion Index = 3.4661756E-7
Boson Index = 0.9999996534

Photoelectric:

PE_Maldonite=1,809.55 barns/electron
U=PE_Maldonite x r_electron=22987.22 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Maldonite is Not Radioactive

Maldonite Classification

Dana Class:

1.1.3.1 (1)Native Elements

(1.1)with metallic elements other than the platinum group

(1.1.3)Dana Group

1.1.3.1 Maldonite Au2Bi F d3m 4/m 3 2/m

Strunz Class:

II/A.03-40 II - Sulfides and sulphosalts

II/A - Alloys and alloylike compounds, with Copper, Silver, Gold and Nickel

II/A.03 - Bezsmertnovite - Maldonite series

II/A.03-10 Bezsmertnovite Au4Cu(Te,Pb) Pmmn 2/m 2/m 2/m

II/A.03-30 Bilibinskite Au3Cu2PbTe2 Unk Cubic

II/A.03-40 Maldonite Au2Bi F d3m 4/m 3 2/m

Other Maldonite Information

References:

NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)

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Maldonite

Au2Bi
Dana No: 1.1.3.1 Strunz No: II/A.03-40
Locality:

Notes: