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 ed.:

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

Lustre:

Metallic

Transparency:

Opaque

Colour:

Brass yellow

Hardness:

3 on Mohs scale

Hardness:

VHN₂₀=77 - 79 kg/mm² - Vickers

Tenacity:

Malleable

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

Type:

Isotropic

Reflectivity:

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

Graph shows reflectance levels at different wavelengths (in nm). Peak reflectance is 72.14%.
R₁ shown in black, R₂ shown in

Colour in reflected light:

Pale brown

Chemistry of Goldamalgam (of Chen et al.)Hide

Mindat Formula:

(Au,Ag)Hg

Element Weights:

Element	% weight
Hg	50.456 %

Calculated from ideal end-member formula.

Elements listed:

Ag, Au, Hg - search for minerals with similar chemistry

Crystallography of Goldamalgam (of Chen et al.)Hide

Crystal System:

Isometric

Class (H-M):

m3m(4/m32/m) - Hexoctahedral

Space Group:

Im3m

Cell Parameters:

a = 10.01 Å

Unit Cell V:

1,003.00 Å³ (Calculated from Unit Cell)

X-Ray Powder DiffractionHide

Powder Diffraction Data:

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

Synonyms of Goldamalgam (of Chen et al.)Hide

Gold Amalgam (in part)

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

Simplified Chinese:r-金汞齐

Related Minerals - Strunz-mindat Grouping Hide

1.AD.	Aurihydrargyrumite	Au₆Hg₅	Hex. 6/mmm(6/m2/m2/m) : P6₃/mcm
1.AD.05	Native Mercury	Hg	Amor.
1.AD.10	Belendorffite	Cu₇Hg₆	Trig. 3m : R3m
1.AD.10	Kolymite	Cu₇Hg₆	Iso.
1.AD.15a	Paraschachnerite	Ag₃Hg₂	Orth.
1.AD.15c	Eugenite	Ag₁₁Hg₂	Iso. 43m : I43m
1.AD.15b	Luanheite	Ag₃Hg	Hex.
1.AD.15a	Schachnerite	Ag_1.1Hg_0.9	Hex. 6/mmm(6/m2/m2/m) : P6₃/mmc
1.AD.15d	Moschellandsbergite	Ag₂Hg₃	Iso. m3m(4/m32/m)
1.AD.20a	Weishanite	(Au,Ag,Hg)	Hex. 6/mmm(6/m2/m2/m) : P6₃/mmc
1.AD.20c	'Yiyangite'	Au₃Hg	Hex.
1.AD.25	Potarite	PdHg	Tet. 4/mmm(4/m2/m2/m) : P4/mmm
1.AD.30	Leadamalgam	Pb_0.7Hg_0.3	Tet. 4/mmm(4/m2/m2/m) : I4/mmm
1.AD.35	Shosanbetsuite	Ag₃Sn	Orth. mmm(2/m2/m2/m) : Pmmn
1.AD.40	'Unnamed (Au-Hg Amalgam)'	Au₂Hg	Hex. 6/mmm(6/m2/m2/m) : P6₃/mcm

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.

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

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References for Goldamalgam (of Chen et al.)Hide

Reference List:

Palache, Charles, Berman, Harry, Frondel, Clifford (1944) The System of Mineralogy (7th ed.) Vol. 1 - Elements, Sulfides, Sulfosalts, Oxides. John Wiley and Sons, New York.

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).

Huang, Shaofeng (2011) Mineralogical characteristics of gold-mercury minerals in the Davao gold placer of Mindanao islands, Philippines. Geology and Exploration, 47 (5). 935-942

Localities for Goldamalgam (of Chen et al.)Hide

Showing 3 localities.

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the 👁 Image
symbol to view information about a locality. The 👁 Image
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Locality ListHide

👁 Image
- This locality has map coordinates listed. 👁 Image
- This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. 👁 Image
- Good crystals or important locality for species. 👁 Image
- 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 (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.

China
Hebei Chengde Fengning County Boluonuo ⓘ Hongshila Pt-Pd deposit (Hung District)	Keqiao Chen et al. (1981)
Philippines
Mindanao Davao Region Davao del Sur Province ⓘ Davao gold placer	Huang (2011)
USA
California Mariposa County ⓘ Merced River 👁 Image	Petrov (n.d.) +1 other reference

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