Goldamalgam (of Chen et al.)

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Formula:

(Au,Ag)Hg

System:

Isometric

Colour:

Brass yellow

Lustre:

Metallic

Hardness:

Name:

For the composition, being a gold amalgam.

One of several gold amalgams reported so far.

Classification of Goldamalgam (of Chen et al.)

IMA status:

Rejected

Strunz 8th edition ID:

1/A.02-20

Nickel-Strunz 10th (pending) edition ID:

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

Dana 8th edition ID:

1.1.12.1

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

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Physical Properties of Goldamalgam (of Chen et al.)

Lustre:

Metallic

Diaphaneity (Transparency):

Opaque

Colour:

Brass yellow

Hardness (Mohs):

Hardness (Vickers):

VHN₂₀=77 - 79 kg/mm²

Tenacity:

Malleable

Crystallography of Goldamalgam (of Chen et al.)

Crystal System:

Isometric

Class (H-M):

m3m (4/m 3 2/m) - Hexoctahedral

Space Group:

Im3m {I4/m 3 2/m}

Cell Parameters:

a = 10.01Å

Unit Cell Volume:

V 1,003.00 Å³ (Calculated from Unit Cell)

X-Ray Powder Diffraction:

d-spacing		Intensity
2.38		(10)
2.22		(10)
2.12		(5)
1.45		(6)
1.24		(8)
		(

Optical Data of Goldamalgam (of Chen et al.)

Type:

Isotropic

Reflectivity:

430nm	R₁=47.13%	R₂= 33.8%
480nm	R₁=53.73%	R₂= 46.5%
530nm	R₁=62.71%	R₂= 56.4%
590nm	R₁=66.95%	R₂= 62.53%
660nm	R₁=67.76%	R₂= 63.53%
700nm	R₁=72.14%	R₂= 71.31%

Graph shows reflectance levels at different wavelengths (in nm). 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.)

Formula:

(Au,Ag)Hg

Essential elements:

Au, Hg

All elements listed in formula:

Ag, Au, Hg

Analytical Data:

Electron microprobe analysis of material from Hebei Province, China.

Au  (36.64)
Ag   (9.16)
Hg  (53.17)

sum  98.97 wt.-%

Empirical Formula:

(Au

0.69

0.31

)Hg

0.98

Relationship of Goldamalgam (of Chen et al.) to other Species

1.AD.05

1.AD.10

1.AD.10

1.AD.15c

1.AD.15b

1.AD.15d

1.AD.15a

1.AD.15a

1.1

0.9

1.AD.20a

Weishanite

(Au,Ag)

1.AD.25

Potarite

PdHg

1.AD.30

Leadamalgam

HgPb

Other Names for Goldamalgam (of Chen et al.)

Other Languages:

Simplified Chinese:	r-金汞齐

Other Information

Health Warning:

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.)

Reference List:

- +

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).

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Localities for Goldamalgam (of Chen et al.)

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(TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.


China
Hebei Province Chengde Prefecture Longhua Co. Hongshila PGE deposit	Keqiao Chen, Huifang Yang, Letian Ma, and Zhizhong Peng (1981): Dizhi Pinglun 27, 107-115

Philippines
Mindanao Southern Mindanao Region Davao del Sur Province Davao gold placer	Shaofeng Huang (2011): Geology and Exploration 47(5), 935-942

USA
California Mariposa Co. Merced River	Alfredo Petrov collection; Excalibur Mineral Co. microprobe ID.

Mineral	and/or Locality
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