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Proustite

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Joseph Louis Proust
Formula:
Ag3AsS3
Colour:
Scarlet, Vermilion or reddish gray
Lustre:
Adamantine
Hardness:
2 - 2½
Specific Gravity:
5.57
Crystal System:
Trigonal
Name:
After the French chemist and actor Joseph-Louis Proust (26 September 1754 – 5 July 1826).
Dimorph of:
Proustite Group.
Proustite-Pyrargyrite Series.
Trigonal dimorph of Xanthoconite.

One of the so-called "ruby silvers".

Visit gemdat.org for gemological information about Proustite.


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Classification of ProustiteHide

Approved, 'Grandfathered' (first described prior to 1959)
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
3.4.1.1

3 : SULFOSALTS
4 : ø = 3
5.2.3

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

Physical Properties of ProustiteHide

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

Optical Data of ProustiteHide

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

Formula:
Ag3AsS3
Common Impurities:
Sb

Crystallography of ProustiteHide

Crystal System:
Trigonal
Class (H-M):
3m (3 2/m) - Hexagonal Scalenohedral
Space Group:
R3c
Setting:
R3c
Cell Parameters:
a = 10.79 Å, c = 8.69 Å
Ratio:
a:c = 1 : 0.805
Unit Cell V:
876.18 ų (Calculated from Unit Cell)
Z:
6
Morphology:
Prismatic crystals to 8 cm, also scalenohedral crystals.
Twinning:
On {1014} to produce trillings, also on {1011}{0001}{0112}

Crystallographic forms of ProustiteHide

Crystal Atlas:
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Proustite no.18 - Goldschmidt (1913-1926)
3d models and HTML5 code kindly provided by www.smorf.nl.

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X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
2.76 (10)
3.28 (8)
3.18 (8)
2.56 (8)
2.48 (8)
1.929 (2)
1.672 (2)

Synonyms of ProustiteHide

Other Language Names for ProustiteHide

Relationship of Proustite to other SpeciesHide

Structurally related to group(s):
Forms a series with:

Common AssociatesHide

Associated Minerals Based on Photo Data:
Arsenic51 photos of Proustite associated with Arsenic on mindat.org.
Xanthoconite44 photos of Proustite associated with Xanthoconite on mindat.org.
Calcite39 photos of Proustite associated with Calcite on mindat.org.
Acanthite38 photos of Proustite associated with Acanthite on mindat.org.
Argentopyrite31 photos of Proustite associated with Argentopyrite on mindat.org.
Quartz25 photos of Proustite associated with Quartz on mindat.org.
Galena13 photos of Proustite associated with Galena on mindat.org.
Gypsum12 photos of Proustite associated with Gypsum on mindat.org.
Silver12 photos of Proustite associated with Silver on mindat.org.
Dolomite11 photos of Proustite associated with Dolomite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

2.GA.05PyrargyriteAg3SbS3Trig. 3m : R3c
2.GA.10PyrostilpniteAg3SbS3Mon.
2.GA.10XanthoconiteAg3AsS3Mon. 2/m : B2/b
2.GA.15SamsoniteAg4MnSb2S6Mon. 2/m : P21/m
2.GA.20SkinneriteCu3SbS3Mon. 2/m : P21/b
2.GA.20WitticheniteCu3BiS3Orth. 2 2 2 : P21 21 21
2.GA.25LapieiteNiCuSbS3Orth.
2.GA.25MückeiteNiCu(Bi,Sb)S3Orth. 2 2 2 : P21 21 21
2.GA.25MalyshevitePdCuBiS3Orth. mmm (2/m 2/m 2/m) : Pmmm
2.GA.25LisiguangitePtCuBiS3Orth. 2 2 2 : P21 21 21
2.GA.30AktashiteCu6Hg3As4S12Trig. 3 : R3
2.GA.30GruzdeviteCu6Hg3Sb4S12Trig.
2.GA.30NowackiiteCu6Zn3As4S12Trig. 3 : R3
2.GA.35LaffittiteAgHgAsS3Mon.
2.GA.40RouthieriteTl(Cu,Ag)(Hg,Zn)2(As,Sb)2S6Tet. 4 2m : I4 2m
2.GA.40StalderiteTl(Cu,Ag)(Zn,Fe,Hg)2(As,Sb)2S6Tet.
2.GA.45ErniggliiteTl2SnAs2S6Trig.
2.GA.50BournonitePbCuSbS3Orth. mm2 : Pmn21
2.GA.50SeligmannitePbCuAsS3Orth. mmm (2/m 2/m 2/m) : Pmmn
2.GA.50SoučekitePbCuBi(S,Se)3Orth.

Related Minerals - Dana Grouping (8th Ed.)Hide

3.4.1.2PyrargyriteAg3SbS3Trig. 3m : R3c

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

5.2.1SmithiteAgAsS2Mon. 2/m
5.2.2TrechmanniteAgAsS2Trig.
5.2.4XanthoconiteAg3AsS3Mon. 2/m : B2/b
5.2.5Pearceite[Ag9CuS4][(Ag,Cu)6(As,Sb)2S7]Trig. 3m (3 2/m) : P3m1
5.2.6Pearceite-T2acTrig. 3 2 : P3 2 1
5.2.7ArgentotennantiteAg6[Cu4(Fe,Zn)2]As4S13Iso. 4 3m : I4 3m
5.2.8MiargyriteAgSbS2Mon. 2/m : B2/b
5.2.9PyrargyriteAg3SbS3Trig. 3m : R3c
5.2.10PyrostilpniteAg3SbS3Mon.
5.2.11StephaniteAg5SbS4Orth. mm2 : Cmc21
5.2.12Polybasite[(Ag,Cu)6(Sb,As)2S7][Ag9CuS4]Mon. 2/m : B2/m
5.2.13BillingsleyiteAg7AsS6Iso. 2 3 : P21 3
5.2.14Polybasite-TacTrig. 3m (3 2/m) : P3m1
5.2.15FreibergiteAg6[Cu4Fe2]Sb4S13-xIso. 4 3m : I4 3m
5.2.16AramayoiteAg3Sb2(Bi,Sb)S6Tric. 1 : P1
5.2.17MatilditeAgBiS2Hex.
5.2.18SchapbachiteAg0.4Pb0.2Bi0.4SIso.
5.2.19PavoniteAgBi3S5Mon. 2/m : B2/m
5.2.20ArcubisiteAg6CuBiS4
5.2.21BohdanowicziteAgBiSe2Trig. 3m (3 2/m) : P3m1
5.2.22SelenostephaniteAg5Sb(Se,S)4Orth.
5.2.23Benleonardite[Ag6(Sb,As)2S6Te] [Ag9Cu(S,Te)2Te2]Trig. 3m (3 2/m) : P3m1
5.2.24VolynskiteAgBiTe2Orth.

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.
Industrial Uses:
ore of silver

References for ProustiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Beudant, F.S. (1832) Proustite, argent antimonié sulfuré en partie. in Traité Élémentaire de Minéralogie, 2nd Edition, (Paris) 445-447.
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.
Engel P, Nowacki W (1966) Die verfeinerung der kristallstruktur von proustit, Ag3AsS3, und pyrargyrit, Ag3SbS3. 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.
Kharbish S, Libowitzky E, Beran A (2007) The effect of As-Sb substitution in the Raman spectra of tetrahedrite-tennantite and pyrargyrite-proustite solid solutions. European Journal of Mineralogy 19, 567-574.

Internet Links for ProustiteHide

Localities for ProustiteHide

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 ListShow

Mineral and/or Locality  
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