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Goldamalgam (of Chen et al.)

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Formula:
(Au,Ag)Hg
Colour:
Brass yellow
Lustre:
Metallic
Hardness:
3
Crystal System:
Isometric
Name:
For the composition, being a gold amalgam.
One of several gold amalgams reported so far.


Hide all sections | Show all sections

Classification of Goldamalgam (of Chen et al.)Hide

Notes:
Rejected by the IMA
1.AD.20b

1 : ELEMENTS (Metals and intermetallic alloys; metalloids and nonmetals; carbides, silicides, nitrides, phosphides)
A : Metals and Intermetallic Alloys
D : Mercury-amalgam family
1.1.12.1

1 : NATIVE ELEMENTS AND ALLOYS
1 : Metals, other than the Platinum Group

Physical Properties of Goldamalgam (of Chen et al.)Hide

Metallic
Transparency:
Opaque
Colour:
Brass yellow
Hardness:
Hardness:
VHN20=77 - 79 kg/mm2 - Vickers
Tenacity:
Malleable

Optical Data of Goldamalgam (of Chen et al.)Hide

Type:
Isotropic
Reflectivity:
430nmR1=47.13%R2= 33.8%
480nmR1=53.73%R2= 46.5%
530nmR1=62.71%R2= 56.4%
590nmR1=66.95%R2= 62.53%
660nmR1=67.76%R2= 63.53%
700nmR1=72.14%R2= 71.31%

Reflectance graph
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 72.14%.
R1 shown in black, R2 shown in red
Colour in reflected light:
Pale brown

Chemical Properties of Goldamalgam (of Chen et al.)Hide

Formula:
(Au,Ag)Hg

Crystallography of Goldamalgam (of Chen et al.)Hide

Crystal System:
Isometric
Class (H-M):
m3m (4/m 3 2/m) - Hexoctahedral
Space Group:
Im3m
Cell Parameters:
a = 10.01 Å
Unit Cell V:
1,003.00 ų (Calculated from Unit Cell)

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
2.38 (10)
2.22 (10)
2.12 (5)
1.45 (6)
1.24 (8)
(

Other Language Names for Goldamalgam (of Chen et al.)Hide

Simplified Chinese:r-金汞齐

Related Minerals - Nickel-Strunz GroupingHide

1.AD.AurihydrargyrumiteAu6Hg5Hex.
1.AD.05MercuryHgTrig. 3m (3 2/m) : R3m
1.AD.10BelendorffiteCu7Hg6Trig.
1.AD.10KolymiteCu7Hg6Iso.
1.AD.15cEugeniteAg11Hg2Iso.
1.AD.15bLuanheiteAg3HgHex.
1.AD.15dMoschellandsbergiteAg2Hg3Iso. m3m (4/m 3 2/m)
1.AD.15aParaschachneriteAg3Hg2Orth.
1.AD.15aSchachneriteAg1.1Hg0.9Hex.
1.AD.20aWeishanite(Au,Ag)3Hg2Hex. 6/mmm (6/m 2/m 2/m) : P63/mmc
1.AD.25PotaritePdHgTet. 4/mmm (4/m 2/m 2/m) : P4/mmm
1.AD.30LeadamalgamPb0.7Hg0.3Tet. 4/mmm (4/m 2/m 2/m) : I4/mmm

Related Minerals - Dana Grouping (8th Ed.)Hide

1.1.12.1ChromiumCrIso. m3m (4/m 3 2/m) : Im3m
1.1.12.2ChromferideFe3Cr1-x (x=0.6)Iso. m3m (4/m 3 2/m) : Pm3m
1.1.12.3FerchromideCr3Fe1-xIso. m3m (4/m 3 2/m) : Pm3m

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Goldamalgam (of Chen et al.)Hide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Palache, Charles, Harry Berman & Clifford Frondel (1944), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Volume I: Elements, Sulfides, Sulfosalts, Oxides. John Wiley and Sons, Inc., New York. 7th edition, revised and enlarged, 834pp.: 105.
Keqiao Chen, Huifang Yang, Letian Ma, and Zhizhong Peng (1981): The discovery of two new minerals - goldamalgam and leadamalgam. Dizhi Pinglun 27, 107-115 (in Chinese with English abstract). - Abstracted in: American Mineralogist 70, 214-221 (1985).
Shaofeng Huang (2011): Mineralogical characteristics of gold-mercury minerals in the Davao gold placer of Mindanao islands, Phillippines, and its prospecting significance. Geology and Exploration 47(5), 935-942 (in Chinese with English abstract).

Internet Links for Goldamalgam (of Chen et al.)Hide

Localities for Goldamalgam (of Chen et al.)Hide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
China
 
  • Hebei Province
    • Chengde Prefecture
      • Fengning Co.
        • Boluonuo
Keqiao Chen, Huifang Yang, Letian Ma, and Zhizhong Peng (1981): Dizhi Pinglun 27, 107-115
Philippines
 
  • Mindanao
    • Southern Mindanao Region
      • Davao del Sur Province
Shaofeng Huang (2011): Geology and Exploration 47(5), 935-942
USA
 
  • California
    • Mariposa Co.
Alfredo Petrov collection; Excalibur Mineral Co. microprobe ID.
Mineral and/or Locality  
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