Mineralogy Database

Gold Mineral Data

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General Gold Information

Help on Chemical  Formula: Chemical Formula: Au
Help on Composition: Composition: Molecular Weight = 196.97 gm
   Gold 100.00 %  Au
        ______ 
        100.00 % 
Help on Empirical Formula: Empirical Formula: Au
Help on Environment: Environment: Quartz veins and alluvial deposits.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) Prehistoric
Help on Locality: Locality: Sierra Nevada Mountains, Nome, Alaska and many other places in the world. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Anglo Saxon, of uncertain origin.
Help on Name Pronunciation: Name Pronunciation: Gold Say GOLD
Help on Synonym: Synonym: Electrum - Ag Alloy
  ICSD 64701
  Oro
  PDF 4-784
 

Gold Image

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  Gold   Silver

Comments: Very well crystallized Electrum (Silver rich gold) on quartz. The analysis gave 31.47% silver.
Location: Verespatak (now Rosia Montana), Transylvania, Romania. Scale: 2.8 x 3.4 cm.
© Fabre Minerals

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  Gold

Comments: Well crystallized bright metallic gold specimen.
Location: Red Ledge mine, Nevada Co., California. Scale: 3.5 x 6 cm in size.
© Dan Weinrich

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  Isomertieite   Arsenopalladinite   Gold   Bornite

Comments: Light grayish grain of intimately intergrown isomertieite and arsenopalladinite (in the center of the picture), with pale yellow gold and brownish to violet bornite. Polished section (from microprobe analysis) in reflected light.
Location: Noril'sk, Putoran Mts, Taymyrskiy Autonomous Okrug, Eastern-Siberian Region, Russia. Scale: Picture size 0.1 mm.
© Thomas Witzke / Abraxas-Verlag

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  Petzite   Gold

Comments: Dark, stubby petzite crystals with native gold on quartz.
Location: Rosia Montana (Verespatak), Transylvania, Romania. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

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  Gold

Comments: Two skeletal octahedral crystals of gold. Stereo pair images..
Location: Berezovsk Mine, Russia. Scale: Crystal size 1.1 cm.
© John Veevaert

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  Rucklidgeite   Gold

Comments: Polished section (PPL) image of sphalerite(sph)-chalcopyrite ore associated with hessite (he), rucklidgeite (rk), pyrite (py) and native gold (Au).
Location: Level 1070 m., Massive sulphide deposits of the Hanson-Flin Flon-Snow Lake, Manitoba, Saskatchewan, Canada. Scale: Picture Size 0,12 mm.
© National Resouces of Canada

Gold Crystallography

Help on Cell Dimensions: Cell Dimensions: a = 4.0786, Z = 4; V = 67.85 Den(Calc)= 19.28
Help on Crystal System: Crystal System: Isometric - Hexoctahedral H-M Symbol (4/m 3 2/m) Space Group: F m3m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.355(1), 2.039(0.52), 1.23(0.36),
Help on Forms: Forms:

Mouse
Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize

Keyboard
S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu

Help on Above

Forms: ( 1 1 1)

Warning: this java applet does not work in some browsers because of security restrictions.

 

Physical Properties of Gold

Help on Cleavage: Cleavage: None
Help on Color: Color: Yellow, Pale yellow, Orange, Yellow white, Reddish white.
Help on Density: Density: 16 - 19.3, Average = 17.64
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Hackly - Jagged, torn surfaces, (e.g. fractured metals).
Help on Habit: Habit: Arborescent - "Tree like" growths of branched systems (e.g. silver).
Help on Habit: Habit: Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Help on Habit: Habit: Platy - Sheet forms (e.g. micas).
Help on Hardness: Hardness: 2.5-3 - Finger Nail-Calcite
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Metallic
Help on Magnetism: Magnetism: Nonmagnetic
Help on Streak: Streak: yellow
 

Optical Properties of Gold

Help on Optical Data: Optical Data: NCalc= 4.05 - from Gladstone-Dale relationship (KC = 0.1582) where Ncalc=Dcalc*KC+1
NCalc= 3.79 - from Gladstone-Dale relationship (KC = 0.1582) where Ncalc=Dmeas*KC+1
Help on RL Color: RL Color: Gold-yellow when pure, silver white to copper-red when impure, blue and green in transmitted light.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Gold in Air
λ R  ∑ R(λ) 
 400 nm   24.90   
 420 nm   26.50 
 440 nm   28.10 
 460 nm   31.60 
 480 nm   39.00 
 500 nm   49.50 
 520 nm   57.80 
 540 nm   63.40 
 560 nm   67.80 
 580 nm   71.00 
 600 nm   73.80 
 620 nm   76.10 
 640 nm   78.20 
 660 nm   80.10 
 680 nm   81.90 
 700 nm   83.60 
Calculated Relative Intensity Colors of Gold in Air
Relative
Intensity
   0%   30%   60%   90% 100% 120% 150% 180% 210% 240% 270% 280%
R                        
 

Calculated Properties of Gold

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=15.5 gm/cc
note: Specific Gravity of Gold =19.3 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0
Boson Index = 1
Help on Photoelectric: Photoelectric: PEGold =1,695.89 barns/electron
U=PEGold x rElectron Density=26228.24 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Gold is Not Radioactive
 

Gold Classification

Help on  Dana Class: Dana Class: 01.01.01.01 (01)Native Elements
  (01.01)with metallic elements other than the platinum group
  (01.01.01)Gold group
 
01.01.01.01 Gold Au F m3m 4/m 3 2/m
 
01.01.01.02 Silver Ag F m3m 4/m 3 2/m
 
01.01.01.03 Copper Cu F m3m 4/m 3 2/m
 
01.01.01.04 Lead Pb F m3m 4/m 3 2/m
 
01.01.01.05 Aluminum Al F m3m,P m3m 4/m 3 2/m
Help on  Strunz Class: Strunz Class: 01.AA.05 01 - ELEMENTS (Metals and intermetallic alloys; metalloids and nonmetals; carbides, silicides, nitrides, phosphides)
  01.A - Metals and Intermetallic Alloys
  01.AA -Copper-cupalite family
 
01.AA.05 Aluminum Al F m3m,P m3m 4/m 3 2/m
 
01.AA.05 Copper Cu F m3m 4/m 3 2/m
 
01.AA.05 Lead Pb F m3m 4/m 3 2/m
 
01.AA.05 Gold Au F m3m 4/m 3 2/m
 
01.AA.05 Nickel Ni F m3m 4/m 3 2/m
 
01.AA.05 Silver Ag F m3m 4/m 3 2/m
 

Other Gold Information

Help on References: References: NAME( Sinkankas66) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)
Help on See Also: See Also: Links to other databases for Gold :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - Franklin Minerals(Dunn)
5 - GeoScienceWorld
6 - Glendale Community College
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - HyperPhysics
12 - MinDAT
13 - Mineral and Gemstone Kingdom
14 - Mineralienatlas (Deutsch)
15 - Online Mineral Museum
16 - Philatelic Mineralogy
17 - QUT Mineral Atlas
18 - Ruff.Info
19 - Scandinavian mineral gallery
20 - University of Texas at Austin
21 - WWW-MINCRYST
22 - YupRocks

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Gold

Au
Dana No: 01.01.01.01 Strunz No: 01.AA.05
Locality:

 

Notes:

 

 
   
 


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