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Aurihydrargyrumite

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Formula:
Au6Hg5
Lustre:
Metallic
Hardness:
2½
Specific Gravity:
16.86 (Calculated)
Crystal System:
Hexagonal
Name:
For its composition, being a natural amalgam of gold (Latin: aurum) and mercury (Latin: hydrargyrum).
The natural Au6Hg5 phase (synthetic). Aurihydrargyrumite forms through the weathering of mercury-bearing placer gold by involvement of self-electrorefining. The core of the particle consists mainly of a gold–silver–mercury alloy which is overlain by a gold-rich zone consists of a gold–mercury alloy, where the silver components are generally absent.


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Classification of AurihydrargyrumiteHide

IMA status:
Approved
Approval Year:
2017
First Published:
2018
Strunz 8th ed.:
1/A.02-
Strunz 9th ed.:
1.AD.
Nickel-Strunz 10th (pending) ed.:
1.AD.

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

Physical Properties of AurihydrargyrumiteHide

Lustre:
Metallic
Comment:
Metallic silver luster
Streak:
Silver white
Hardness:
2½ on Mohs scale
Tenacity:
Malleable
Density:
16.86 g/cm3 (Calculated)

Chemical Properties of AurihydrargyrumiteHide

Formula:
Au6Hg5
Elements listed:
Au, Hg - search for minerals with similar chemistry

Crystallography of AurihydrargyrumiteHide

Crystal System:
Hexagonal
Class (H-M):
6/mmm (6/m 2/m 2/m) - Dihexagonal Dipyramidal
Space Group:
P63/mcm
Setting:
P63/mcm
Cell Parameters:
a = 6.9960(10) Å, c = 10.154(2) Å
Ratio:
a:c = 1 : 1.451
Unit Cell V:
430.4 ų
Morphology:
Submicron- to 2 μm-thick layer on placer gold. A prismatic face may be formed by {001} and {100} or {110}.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
2.877(29)
2.434(42)
2.337(100)
2.234(87)
1.401(39)
1.301(41)
1.286(29)
1.225(65)
Comments:
From Type Description.

Occurrences of AurihydrargyrumiteHide

Paragenetic Mode(s):

Type Occurrence of AurihydrargyrumiteHide

Type Locality:
ⓘ Iyoki, Uchiko, Ouzu City, Ehime, Japan
General Appearance of Type Material:
As as a submicron- to 2 μm-thick layer on the outermost surface of the placer gold.
Place of Conservation of Type Material:
Type material is deposited in the mineralogical collections of the National Museum of Nature and Science, Tsukuba, Japan, specimen number NSM-45047
Empirical Formula of Type Material:
Au5.95Hg5.05
Associated Minerals at Type Locality:
Gold
Reference:
Nishio-Hamane, D., Tanaka, T., Minakawa, T. (2018): Aurihydrargyrumite, a Natural Au6Hg5 Phase from Japan. Minerals, 8: 415
Download:
https://doi.org/10.3390/min8090415

Synonyms of AurihydrargyrumiteHide

Related Minerals - Nickel-Strunz GroupingHide

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.20bGoldamalgam (of Chen et al.)(Au,Ag)HgIso. m3m (4/m 3 2/m) : Im3m
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

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 AurihydrargyrumiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Nishio-Hamane, D. and Minakawa, T. (2017) Aurihydrargyrumite, IMA 2017-003. CNMNC Newsletter No. 37, June 2017, page 739; Mineralogical Magazine: 81: 737–742.
Nishio-Hamane, D., Tanaka, T., Minakawa, T. (2018): Aurihydrargyrumite, a Natural Au6Hg5 Phase from Japan. Minerals, 8: 415; https://doi.org/10.3390/min8090415

Internet Links for AurihydrargyrumiteHide

Localities for AurihydrargyrumiteHide

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.
Japan (TL)
 
  • Ehime
    • Ouzu City
      • Uchiko
Nishio-Hamane, D. and Minakawa, T. (2017) Aurihydrargyrumite, IMA 2017-003. CNMNC Newsletter No. 37, June 2017, page 739; Mineralogical Magazine, 81, 737–742. ;Nishio-Hamane, D., Tanaka, T., Minakawa, T. (2018): Aurihydrargyrumite, a Natural Au6Hg5 Phase from Japan. Minerals, 8: 415;
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