Allargentum
A valid IMA mineral species - grandfathered
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About Allargentum
Formula:
(Ag1-xSbx)
(x ≈ 0.09-0.16). Sometimes simplified as Ag6Sb.
May contain considerable amounts of Au replacing Ag.
May contain considerable amounts of Au replacing Ag.
Colour:
Silver
Lustre:
Metallic
Hardness:
3½
Specific Gravity:
10.0
Crystal System:
Hexagonal
Name:
From the Greek άλλος ("allos") for "another" and Latin argentum, "silver".
Unique Identifiers
Mindat ID:
128
Long-form identifier:
mindat:1:1:128:1
IMA Classification of Allargentum
Approved, 'Grandfathered' (first described prior to 1959)
IMA Formula:
Ag1-xSbx (x=0.09-0.16)
Approval year:
1970
Approval history:
Approveed by IMA in 1970, special procedure.
Classification of Allargentum
2.AA.30
2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
A : Alloys
A : Alloys of metalloids with Cu, Ag, Au
2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
A : Alloys
A : Alloys of metalloids with Cu, Ag, Au
2.2.1.2
2 : SULFIDES
2 : AmBnXp, with (m+n):p = 3:1
2 : SULFIDES
2 : AmBnXp, with (m+n):p = 3:1
1.46
1 : Elements and Alloys (including the arsenides, antimonides and bismuthides of Cu, Ag and Au)
1 : Elements and Alloys (including the arsenides, antimonides and bismuthides of Cu, Ag and Au)
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| All | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Allargentum
Metallic
Transparency:
Opaque
Colour:
Silver
Hardness:
3½ on Mohs scale
Hardness:
VHN100=172 - 203 - Vickers
Density:
10.0 g/cm3 (Measured) 10.12 g/cm3 (Calculated)
Comment:
On synthetic material
Optical Data of Allargentum
Anisotropism:
Weak
Bireflectance:
Strong
Reflectivity:
| Wavelength | R1 (%) | R2 (%) |
|---|---|---|
| 400nm | 67.0% | 68.8% |
| 420nm | 66.5% | 68.2% |
| 440nm | 66.0% | 67.6% |
| 460nm | 65.9% | 67.3% |
| 480nm | 67.1% | 68.6% |
| 500nm | 67.4% | 68.7% |
| 520nm | 68.9% | 70.4% |
| 540nm | 69.5% | 70.9% |
| 560nm | 70.2% | 71.6% |
| 580nm | 70.5% | 71.8% |
| 600nm | 71.0% | 72.3% |
| 620nm | 71.7% | 73.0% |
| 640nm | 72.1% | 73.4% |
| 660nm | 72.6% | 73.9% |
| 680nm | 73.1% | 74.3% |
| 700nm | 73.8% | 74.9% |
Graph shows reflectance levels at different wavelengths (in nm). Peak reflectance is 74.9%.
R1 shown in black, R2 shown in red
Chemistry of Allargentum
Mindat Formula:
(Ag1-xSbx)
(x ≈ 0.09-0.16). Sometimes simplified as Ag6Sb.
May contain considerable amounts of Au replacing Ag.
(x ≈ 0.09-0.16). Sometimes simplified as Ag6Sb.
May contain considerable amounts of Au replacing Ag.
Elements listed:
Common Impurities:
Hg,Ni,As
Chemical Analysis
wt%
| 1 | |
|---|---|
| Ag | 84.3 % |
| Sb | 15.3 % |
| Hg | 0.3 % |
| Total: | 99.9 % |
Sample references:
| ID | Locality | Reference | Notes |
|---|---|---|---|
| 1 | Cobalt area, Cobalt-Gowganda region, Timiskaming District, Ontario, Canada | EMPA analysis of sample from cobalt ore |
Crystallography of Allargentum
Crystal System:
Hexagonal
Cell Parameters:
a = 2.952 Å, c = 4.773 Å
Ratio:
a:c = 1 : 1.617
Unit Cell V:
36.02 ų (Calculated from Unit Cell)
Z:
2
Morphology:
In complex intergrowths with silver, and as very small grains.
Comment:
Crystal class = nd; Point group = nd
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0005089 | Allargentum | Petruk W, Cabri L J, Harris D C, Stewart J M, Clark L A (1970) Allargentum, redefined The Canadian Mineralogist 10 163-172 |  | 1970 | Hi-Ho mine, Cobalt, Ontario, Canada | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 2.545 Å | (70) |
| 2.396 Å | (70) |
| 2.245 Å | (100) |
| 1.744 Å | (40) |
| 1.469 Å | (40) |
| 1.352 Å | (60) |
| 1.252 Å | (50) |
| 1.228 Å | (40) |
| 1.082 Å | (40) |
| 0.995 Å | (40) |
Comments:
Synthetic (ICDD 25-54).
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| High-? alteration and/or metamorphism | |
| 33 : Minerals deposited by hydrothermal metal-rich fluids (see also [#12]) |
Geological Setting:
Silver-antimony ores (Ni-Co-Ag deposits); In high-grade Ag–Sb ores
Type Occurrence of Allargentum
General Appearance of Type Material:
In complex intergrowths with silver, and as very small grains.
Place of Conservation of Type Material:
Canadian Museum of Nature, Ottawa, 61343–61345, 61519; The Natural History Museum, London, England; National Museum of Natural History, Washington, D.C., USA, 135409.
Geological Setting of Type Material:
5 element Silver-Nickel-Cobalt-Bismuth-Uranium veins
Associated Minerals at Type Locality:
Other Language Names for Allargentum
Dutch:Allargentum
French:Allargentum
German:Allargentum
Norwegian:Allargentum
Russian:Алларгентум
Simplified Chinese:六方锑银矿
Common Associates
Associations Based on Photo Data:
| 139 photos of Allargentum associated with Calcite | CaCO3 |
| 120 photos of Allargentum associated with Native Silver | Ag |
| 93 photos of Allargentum associated with Dyscrasite | Ag3Sb |
| 43 photos of Allargentum associated with 'Antimonial Silver' | (Ag,Sb) |
| 40 photos of Allargentum associated with Actinolite | ◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2 |
| 29 photos of Allargentum associated with Löllingite | FeAs2 |
| 19 photos of Allargentum associated with Rammelsbergite | NiAs2 |
| 19 photos of Allargentum associated with Nickelskutterudite | NiAs3 |
| 17 photos of Allargentum associated with Native Arsenic | As |
| 13 photos of Allargentum associated with Acanthite | Ag2S |
Related Minerals - Strunz-mindat Grouping
| 2.AA. | Trigodomeykite | Cu3-xAs |
| 2.AA.10b | Domeykite | Cu3As |
| 2.AA.10a | Algodonite | (Cu1-xAsx) |
| 2.AA.10d | Koutekite | Cu5As2 |
| 2.AA.15 | Novákite | (Cu,Ag)21As10 |
| 2.AA.20 | Cuprostibite | Cu2(Sb,Tl) |
| 2.AA.25 | Kutinaite | Ag6Cu14As7 |
| 2.AA.35 | Dyscrasite | Ag3Sb |
| 2.AA.40 | Maldonite | Au2Bi |
| 2.AA.45 | Stistaite | SnSb |
| 2.AA.50 | Zaccariniite | RhNiAs |
| 2.AA.55 | Dienerite | Ni3As |
Other Information
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 Allargentum
mindat.org URL:
https://www.mindat.org/min-128.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Allargentum
Reference List:
Westgren, A.; Hägg, G.; Eriksson, S. (1929) Röntgenanalyse der Systeme Kupfer—Antimon und Silber—Antimon. Zeitschrift für Physikalische Chemie, 4B (1). 453-468 doi:10.1515/zpch-1929-0433
Weibke, Friedrich; Efinger, Isolde (1940) Der Aufbau der Legierungen des Systems Silber‐Antimon. Zeitschrift für Elektrochemie und angewandte physikalische Chemie, 46 (2). 53-60 doi:10.1002/bbpc.19400460202
Somanchi, S. (1966) Subsolidus phase relations in the system Ag-Sb. Canadian Journal of Earth Sciences, 3 (2). 211-222 doi:10.1139/e66-017
Ramdohr, Paul (1969) The Ore Minerals and their Intergrowths. Pergamon Press, Oxford. 1174pp. doi:10.1016/c2013-0-10027-x
Petruk, W., Cabri, L.J., Harris, D.C., Stewart, J.M., Clark, L.A. (1970) Allargentum, redefined. The Canadian Mineralogist, 10 (2) 163-172
Localities for Allargentum
Showing 85 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and 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).
All localities listed without proper references should be considered as questionable.
Argentina | |
| Brodtkorb (2002) |
| Sureda (1978) |
Australia | |
| Petruk et al. (1970) +2 other references |
| Lawrence (1968) +1 other reference |
| Sielecki (1988) |
| Sielecki (1988) | |
| Walters et al. (1998) +1 other reference |
| Ehrig et al. (2012) |
Austria | |
| Paar et al. (2018) |
Bulgaria | |
| Mladenova et al. (2017) |
Canada | |
| Duff (2016) |
| Harris et al. (1984) |
| Kidd Operations |
| Canadian Mineralogist (1971) |
| 159-161. +2 other references |
| Ramdohr (1950) +2 other references |
| Montgomery (n.d.) | |
| Mielke (n.d.) | |
| Berry (1971) | |
| Berry (1971) | |
| Mielke (n.d.) | |
| Mielke (n.d.) +2 other references | |
| Canadian Mineralogist Volume II | |
| personal correspondence with Doug Scott | |
| Sabina (2000) | |
| ontariominerals.com | |
| Ontario Geological Survey Miscellaneous ... +1 other reference | |
| Petruk et al. (1970) | |
China | |
| He Zhang et al. (2018) |
| Yan Liu et al. (2011) |
| Leiming Xu et al. (1993) +1 other reference |
| www.fabiao.net (n.d.) |
| Wentao Sun et al. (2008) |
| Jiyuan Zhou et al. (1999) |
Czech Republic | |
| Šrein (2007) |
| Dobešová (2012) |
| Anthony et al. (1990) | |
| Pažout et al. (2019) | |
| Pažout et al. (2017) | |
| Škácha et al. (2012) |
| Zachariáš et al. (2017) | |
| Dolníček Z et al. (2019) |
Finland | |
| Kojonen Kari 1989. The early ... |
France | |
| Mineralogical Society of America - ... +1 other reference |
Germany | |
| www.birchiburg.de (2003) |
| Thorne (n.d.) +2 other references |
| Eigenfunde/Halde Manfred Gross +1 other reference |
| Eigenfunde/Halde Manfred Gross | |
| Eigenfunde/Halde Manfred Gross | |
| Haas (n.d.) |
Greenland | |
| Petersen (2001) |
| Karup-Møller et al. (1974) +1 other reference |
Kazakhstan | |
| Pekov et al. (1997) |
Morocco | |
| Praszkier (2010) +1 other reference |
| Nshimiyimana et al. (2018) |
Norway | |
| Kullerud et al. (2016) +1 other reference |
| Kullerud et al. (2016) +1 other reference | |
| Cook (1996) |
| Cook et al. (1998) |
| Neumann (1985) |
Russia | |
| Strujkov et al. (1996) |
| Simanenko (2006) |
| Ratkin et al. (2021) | |
| Nokleberg et al. (2010) |
| Goryachev et al. (2011) |
| Seltmann et al. (2010) |
Sweden | |
| Grensman et al. (2001) +1 other reference |
| Tiu (2019) +1 other reference | |
| Burke et al. (1990) |
| Mineralogical Society of America - ... +1 other reference | |
| Zakrzewski et al. (1984) | |
| Zakrzewski et al. (1984) | |
| Zakrzewski et al. (1984) | |
| Dobbe et al. (1994) +1 other reference |
| Zakrzewski (1984) |
| |
| Rincon (2022) |
| Axelsson et al. (2006) |
| Axelsson et al. (2006) |
| Kieft et al. (1987) |
Tajikistan | |
| Pavel M. Kartashov (n.d.) |
| Moralev et al. (1999) |
USA | |
| Eckel et al. (1997) |
Uzbekistan | |
| Mineralogical Society of America - ... +1 other reference |
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Bouismas Mine, Tansifte Caïdat, Agdz Cercle, Zagora Province, Drâa-Tafilalet Region, Morocco