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Proustite

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Formula:
Ag
 
3
AsS
 
3
System:TrigonalColour:Scarlet, Vermilion or ...
Lustre:AdamantineHardness:2 - 2½
Name:After the French chemist, J. L. Proust (1754-1826).
Dimorph of:Xanthoconite


Proustite Group. Proustite-Pyrargyrite Series. Trigonal dimorph of Xanthoconite.

One of the ruby silvers.

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Classification of Proustite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:2/E.07-10
Nickel-Strunz 10th (pending) edition ID:2.GA.05

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
G : Sulfarsenites, sulfantimonites, sulfbismuthites
A : Neso-sulfarsenites, etc. without additional S
Dana 8th edition ID:3.4.1.1

3 : SULFOSALTS
4 : ø = 3
Hey's CIM Ref.:5.2.3

5 : Sulphosalts - Sulpharsenites and Sulphobismuthites (those containing Sn, Ge,or V are in Section 6)
2 : Sulpharsenites etc. of Ag
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Occurrences of Proustite

Geological Setting:A late forming mineral in hydrothermal veins, also in the supergene zone.

Physical Properties of Proustite

Lustre:Adamantine
Comment:Darkens on exposure to light
Colour:Scarlet, Vermilion or reddish gray
Streak:Vermilion red
Hardness (Mohs):2 - 2½
Hardness (Vickers):VHN25=70 - 105 kg/mm2
Tenacity:Brittle
Cleavage:Distinct/Good
Distinct on {1011}
Fracture:Irregular/Uneven, Conchoidal
Density (measured):5.57 g/cm3
Density (calculated):5.625 g/cm3

Crystallography of Proustite

Crystal System:Trigonal
Class (H-M):3m (3 2/m) - Hexagonal Scalenohedral
Space Group:R3c {R3 2/c}
Cell Parameters:a = 10.79Å, c = 8.69Å
Ratio:a:c = 1 : 0.805
Unit Cell Volume:V 876.18 ų (Calculated from Unit Cell)
Z:6
Morphology:Prismatic crystals
Twinning:On {1014} to produce trillings, also on {1011}{0001}{0112}
Crystal Atlas:
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Proustite no.18 - Goldschmidt (1913-1926)

About Crystal Atlas

The mindat.org Crystal Atlas allows you to view a selection of crystal drawings of real and idealised crystal forms for this mineral and, in certain cases, 3d rotating crystal objects. The 3d models and HTML5 code are kindly provided by www.smorf.nl.

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Optical Data of Proustite

Type:Uniaxial (-)
RI values: nω = 3.087 - 3.088 nε = 2.792
Maximum Birefringence:δ = 0.295 - 0.296

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Very High
Type:Anisotropic
Anisotropism:Strong
Pleochroism:Visible
Comments:Cochineal red to blood red

Chemical Properties of Proustite

Formula:
Ag
 
3
AsS
 
3
Simplified for copy/paste:Ag3AsS3
Essential elements:Ag, As, S
All elements listed in formula:Ag, As, S
Common Impurities:Sb

Relationship of Proustite to other Species

Series:Forms a series with Pyrargyrite (see here)
Structurally related to group(s):
Proustite Group
Related Minerals - Nickel-Strunz Grouping):

- +
2.GA.05Pyrargyrite
Ag
 
3
SbS
 
3
2.GA.10Pyrostilpnite
Ag
 
3
SbS
 
3
2.GA.10Xanthoconite
Ag
 
3
AsS
 
3
2.GA.15Samsonite
Ag
 
4
MnSb
 
2
S
 
6
2.GA.20Skinnerite
Cu
 
3
SbS
 
3
2.GA.20Wittichenite
Cu
 
3
BiS
 
3
2.GA.25Lapieite
NiCuSbS
 
3
2.GA.25Mückeite
NiCu(Bi,Sb)S
 
3
2.GA.25Malyshevite
PdCuBiS
 
3
2.GA.25Lisiguangite
PtCuBiS
 
3
2.GA.30Aktashite
Cu
 
6
Hg
 
3
As
 
4
S
 
12
2.GA.30Gruzdevite
Cu
 
6
Hg
 
3
Sb
 
4
S
 
12
2.GA.30Nowackiite
Cu
 
6
Zn
 
3
As
 
4
S
 
12
2.GA.35Laffittite
AgHgAsS
 
3
2.GA.40Routhierite
Tl(Cu,Ag)(Hg,Zn)
 
2
(As,Sb)
 
2
S
 
6
2.GA.40Stalderite
Tl(Cu,Ag)(Zn,Fe,Hg)
 
2
(As,Sb)
 
2
S
 
6
2.GA.45Erniggliite
Tl
 
2
SnAs
 
2
S
 
6
2.GA.50Bournonite
PbCuSbS
 
3
2.GA.50Seligmannite
PbCuAsS
 
3
2.GA.50Součekite
PbCuBi(S,Se)
 
3
Related Minerals - Hey's Index Grouping:

- +
5.2.1Smithite
AgAsS
 
2
5.2.2Trechmannite
AgAsS
 
2
5.2.4Xanthoconite
Ag
 
3
AsS
 
3
5.2.5Pearceite
[(Ag,Cu)
 
6
(As,Sb)
 
2
S
 
7
][Ag
 
9
CuS
 
4
]
5.2.6Pearceite-T2ac
5.2.7Argentotennantite
Ag
 
6
[Cu
 
4
(Fe,Zn)
 
2
]As
 
4
S
 
13
5.2.8Miargyrite
AgSbS
 
2
5.2.9Pyrargyrite
Ag
 
3
SbS
 
3
5.2.10Pyrostilpnite
Ag
 
3
SbS
 
3
5.2.11Stephanite
Ag
 
5
SbS
 
4
5.2.12Polybasite
[(Ag,Cu)
 
6
(Sb,As)
 
2
S
 
7
][Ag
 
9
CuS
 
4
]
5.2.13Billingsleyite
Ag
 
7
AsS
 
6
5.2.14Polybasite-Tac
5.2.15Freibergite
Ag
 
6
[Cu
 
4
Fe
 
2
]Sb
 
4
S
 
13-x
5.2.16Aramayoite
Ag(Sb,Bi)S
 
2
5.2.17Matildite
AgBiS
 
2
5.2.18Schapbachite
Ag
 
0.4
Pb
 
0.2
Bi
 
0.4
S
5.2.19Pavonite
(Ag,Cu)(Bi,Pb)
 
3
S
 
5
5.2.20Arcubisite
Ag
 
6
CuBiS
 
4
5.2.21Bohdanowiczite
AgBiSe
 
2
5.2.22Selenostephanite
Ag
 
5
Sb(Se,S)
 
4
5.2.23Benleonardite
Ag
 
8
(Sb,As)Te
 
2
S
 
3
5.2.24Volynskite
AgBiTe
 
2

Other Names for Proustite

Synonyms:
Arsenical Red SilverArsenical Silver BlendeLight red silver ore
Other Languages:
Catalan:Proustita
Dutch:Proustiet
French:Argent rouge arsenicale
German:Proustit
Arseniksilberblende
Durchsichtig Rodtguldenerz
Lichtes Rotgültigerz
Lichtes Rothgültigerz
Italian:Proustite
Latin:Argentum rudum rubrum
Polish:Proustyt
Russian:Прустит
Simplified Chinese:淡红银矿
Slovak:Proustit
Spanish:Proustita
Ukrainian:Прустит

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 Proustite

Reference List:

- +
Miers and Prior (1887), Mineralogical Magazine: 7: 196.

Miers (1888), Mineralogical Magazine: 8: 37.

Ransome (1910), Economic Geology: 5: 211.

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: 366-369.

Neues Jahrbuch für Mineralogie, Monatshefte (1966): 181-184.

Anthony, J.W., Bideaux, R.A., Bladh, K.W., and Nichols, M.C. (1990) Handbook of Mineralogy, Volume I. Elements, Sulfides, Sulfosalts. Mineral Data Publishing, Tucson, AZ, 588pp.: 423.

Harlov, D.E. (1999): Thermochemistry of Ag-Cu exchange equilibria between proustite, sinnerite, and pearceite; constraints on Ag-Cu and As-Sb mixing in pyrargyrite-proustite. European Journal of Mineralogy, 11, 709-719.

Internet Links for Proustite

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  • Raman and XRD data at RRUFF project
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