Gold Mineral Data

Gold Mineral Data +

We specialise in top quality, fine minerals from Morocco, Namibia,
South Africa, Pakistan, Democratic Republic of Congo (ZaÃƒï¿½Ã‚Â¯re) and China
Worldwide Fine Minerals by B & C GOBIN

General Gold Information

Chemical Formula:

Composition:

Molecular Weight = 196.97 gm

Gold 100.00 % Au

______

100.00 %

Empirical Formula:

Environment:

Quartz veins and alluvial deposits.

IMA Status:

Valid Species (Pre-IMA) Prehistoric

Locality:

Sierra Nevada Mountains, Nome, Alaska and many other places in the world. Link to MinDat.org Location Data.

Name Origin:

Anglo Saxon, of uncertain origin.

Synonym:

Electrum - Ag Alloy

ICSD 64701

Oro

PDF 4-784

Gold Image

Images:

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

Images:

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

Images:

Gold Isomertieite Arsenopalladinite 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

Images:

Gold Petzite

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

Images:

Gold

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

Gold Crystallography

Cell Dimensions:

a = 4.0786, Z = 4; V = 67.85 Den(Calc)= 19.28

Crystal System:

Isometric - HexoctahedralH-M Symbol (4/m 3 2/m) Space Group: F m3m

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.355(1), 2.039(0.52), 1.23(0.36),

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 large pop-up is very compute intensive and may not work well with some computers.

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

Wyckoff R W G , Crystal Structures , 1 (1963) p.7-83, Second edition. Interscience Publishers, New York, New York, Cubic closest packed, ccp, structure

View Additional jPOWD Structure files for Gold
[jpx]

Physical Properties of Gold

Cleavage:

None

Color:

Yellow, Pale yellow, Orange, Yellow white, Reddish white.

Density:

16 - 19.3, Average = 17.64

Diaphaniety:

Opaque

Fracture:

Hackly - Jagged, torn surfaces, (e.g. fractured metals).

Habit:

Arborescent - "Tree like" growths of branched systems (e.g. silver).

Habit:

Granular - Generally occurs as anhedral to subhedral crystals in matrix.

Habit:

Platy - Sheet forms (e.g. micas).

Hardness:

2.5-3 - Finger Nail-Calcite

Luminescence:

None.

Luster:

Metallic

Magnetism:

Nonmagnetic

Streak:

yellow

Optical Properties of Gold

RL Color:

Gold-yellow when pure, silver white to copper-red when impure, blue and green in transmitted light.

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

Electron Density:

r_electron=15.5 gm/cc
note: r_Gold=19.3 gm/cc.

Fermion Index

Fermion Index = 0
Boson Index = 1

Photoelectric:

PE_Gold=1,695.89 barns/electron
U=PE_Gold x r_electron=26228.24 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Gold is Not Radioactive

Gold Classification

Dana Class:

1.1.1.1 (1)Native Elements

(1.1)with metallic elements other than the platinum group

(1.1.1)Gold group

1.1.1.1 Gold Au F m3m 4/m 3 2/m

1.1.1.2 Silver Ag F m3m 4/m 3 2/m

1.1.1.3 Copper Cu F m3m 4/m 3 2/m

1.1.1.4 Lead Pb F m3m 4/m 3 2/m

1.1.1.5 Aluminum Al F m3m,P m3m 4/m 3 2/m

Strunz Class:

I/A.01-40 I - Elements

I/A - Metallic and intermetallic compounds, Carbides, Nitrides, Phosphides and Silicides

I/A.01 - Series Copper, Silver and Gold

I/A.01-10 Copper Cu F m3m 4/m 3 2/m

I/A.01-15 Allabogdanite! (Fe,Ni)2P P nma 2/m 2/m 2/m

I/A.01-20 Silver Ag F m3m 4/m 3 2/m

I/A.01-40 Gold Au F m3m 4/m 3 2/m

I/A.01-50 Auricupride Cu3Au P m3m 4/m 3 2/m

I/A.01-60 Tetra-auricupride AuCu P 4/mmm 4/m 2/m 2/m

I/A.01-65 Bogdanovite (Au,Te,Pb)3(Cu,Fe) P m3m 4/m 3 2/m

I/A.01-68 Hunchunite! (Au,Ag)2Pb F d3m 4/m 3 2/m

I/A.01-70 Anyuiite Au(Pb,Sb)2 I 4/mcm 4/m 2/m 2/m

Other Gold Information

References:

NAME( Sinkankas66) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)

Search for Gold using:

[ALTAVISTA] [AOL] [About.com] [All-The-Web] [HotBot] [Ixquick] [LookSmart] [MAMMA] [MSN.COM] [Netscape] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Gold :
AA Mineral Specimens
B and L Minerals
Dan Weinrich Fine Minerals
Dan Weinrich Auctions
e-Rocks Auctions
Excalibur Minerals
Exceptional Minerals
Fabre Minerals
Greenside Minerals
John Betts Fine Minerals
Masons Minerals
Minernet.it
Mineral News
Mineral of the Month Club
MineralsWeb Fine Minerals
Rockshop.cz Kalat Fine Minerals
T G Fine Minerals
Wrights Rock Shop

Translate Gold Mineral Data :

Ask about Gold here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

Print or Cut-and-Paste your Gold Specimen Label here :

Gold

Au
Dana No: 1.1.1.1 Strunz No: I/A.01-40
Locality:

Notes: