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Stromeyerite

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Friedrich Stromeyer
Formula:
AgCuS
System:
Orthorhombic
Colour:
Blue gray, dark blue, ...
Lustre:
Metallic
Hardness:
2½ - 3
Name:
Named after German chemist Friedrich Stromeyer (1776-1835), professor of chemistry at the university of Göttingen (Germany) who performed the first chemical analysis.
Chemically similar to mckinstryite.


Classification of Stromeyerite

Approved, 'Grandfathered' (first described prior to 1959)
2.BA.40

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
B : Metal Sulfides, M: S > 1: 1 (mainly 2: 1)
A : With Cu, Ag, Au
2.4.6.1

2 : SULFIDES
4 : AmBnXp, with (m+n):p = 2:1
3.2.10

3 : Sulphides, Selenides, Tellurides, Arsenides and Bismuthides (except the arsenides, antimonides and bismuthides of Cu, Ag and Au, which are included in Section 1)
2 : Sulphides etc. of Ag

Physical Properties of Stromeyerite

Metallic
Diaphaneity (Transparency):
Opaque
Colour:
Blue gray, dark blue, dark steel gray, or steel gray
Streak:
Steel gray
Hardness (Mohs):
2½ - 3
Hardness (Vickers):
VHN25=70 - 72 kg/mm2
Tenacity:
Brittle
Fracture:
Sub-Conchoidal
Density:
6.2 - 6.3 g/cm3 (Measured)    6.33 g/cm3 (Calculated)

Optical Data of Stromeyerite

Type:
Anisotropic
Anisotropism:
Strong - deep violet to vivid blue
Colour in reflected light:
Dull grayish white
Pleochroism:
Visible
Comments:
Air - weak
Oil - strong
Grayish brown to whitish gray with faint bluish gray tinge or creamy white with a pink tint

Chemical Properties of Stromeyerite

Formula:
AgCuS
IMA Formula:
CuAgS
Elements listed in formula:
Common Impurities:
Fe

Crystallography of Stromeyerite

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Cell Parameters:
a = 4.06 Å, b = 6.62 Å, c = 7.94 Å
Ratio:
a:b:c = 0.613 : 1 : 1.199
Unit Cell Volume:
V 213.40 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Prismatic, massive, compact
Twinning:
Common on {101}

Occurrences of Stromeyerite

Type Occurrence of Stromeyerite

Geological Setting of Type Material:
Copper- and silver-bearing veins, where silver replaces copper in bornite

Relationship of Stromeyerite to other Species

2.BA.05ChalcociteCu2S
2.BA.05DjurleiteCu31S16
2.BA.05GeeriteCu8S5
2.BA.05RoxbyiteCu9S5
2.BA.10AniliteCu7S4
2.BA.10DigeniteCu9S5
2.BA.15BorniteCu5FeS4
2.BA.20BellidoiteCu2Se
2.BA.20BerzelianiteCu2Se
2.BA.25AthabascaiteCu5Se4
2.BA.25UmangiteCu3Se2
2.BA.30RickarditeCu7Te5
2.BA.30WeissiteCu2-xTe
2.BA.35AcanthiteAg2S
2.BA.40MckinstryiteAg5-xCu3+xS4
2.BA.40dUM2003-13-S:AgAuCuAg6AuCu2S5
2.BA.45JalpaiteAg3CuS2
2.BA.45SelenojalpaiteAg3CuSe2
2.BA.50EucairiteAgCuSe
2.BA.55AguilariteAg4SeS
2.BA.55NaumanniteAg2Se
2.BA.60CervelleiteAg4TeS
2.BA.60HessiteAg2Te
2.BA.60ChenguodaiteAg9Fe3+Te2S4
2.BA.65Henryite(Cu,Ag)3+xTe2 , with x ~ 0.40
2.BA.65StütziteAg5-xTe3, x = 0.24-0.36
2.BA.70ArgyroditeAg8GeS6
2.BA.70CanfielditeAg8SnS6
2.BA.70Putzite(Cu4.7Ag3.3)GeS6
2.BA.75FischesseriteAg3AuSe2
2.BA.75Penzhinite(Ag,Cu)4Au(S,Se)4
2.BA.75PetrovskaiteAuAg(S,Se)
2.BA.75PetziteAg3AuTe2
2.BA.75UytenbogaardtiteAg3AuS2
2.BA.80Bezsmertnovite(Au,Ag)4Cu(Te,Pb)
2.BA.80BilibinskitePbCu2Au3Te2
2.BA.80Bogdanovite(Au,Te,Pb)3(Cu,Fe)
3.2.1AcanthiteAg2S
3.2.3NaumanniteAg2Se
3.2.4AguilariteAg4SeS
3.2.5HessiteAg2Te
3.2.6EmpressiteAgTe
3.2.7StütziteAg5-xTe3, x = 0.24-0.36
3.2.8CervelleiteAg4TeS
3.2.9DervilliteAg2AsS2
3.2.11MckinstryiteAg5-xCu3+xS4
3.2.12JalpaiteAg3CuS2
3.2.13EucairiteAgCuSe
3.2.14CameroniteCu5-x(Cu,Ag)3+xTe10 (x = 0.43)
3.2.15Henryite(Cu,Ag)3+xTe2 , with x ~ 0.40
3.2.16SternbergiteAgFe2S3
3.2.17ArgentopyriteAgFe2S3
3.2.18Geffroyite(Cu,Fe,Ag)9(Se,S)8
3.2.19ArgentopentlanditeAg(Fe,Ni)8S8

Other Names for Stromeyerite

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.

References for Stromeyerite

Reference List:
Beudant, F. S. (1832) Stromeÿerine, sulfure d’argent et cuivre. In: Traité Élémentaire de Minéralogie, 2nd Edition, Paris, 410-411.

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, 834 pp.: 190-191.

Frueh, A.J., jr. (1955) The crystal structure of stromeyerite, AgCuS: a possible defect structure. Zeitschrift für Kristallographie 106, 299-307.

Djurle, S. (1958): X-ray study of the Ag-Cu-S system. Acta Chemica Scandinavica 12, 1427-1436.

Skinner, B. J. (1966) The system Cu-Ag-S. Economic Geology 61, 1-26.

Bergstöl, S. & Vokes, F.M. (1974) Stromeyerite and mckinstryite from the Godejord polymetallic sulfide deposit, central Norwegian Caledonides. Mineralium Deposita 9, 325-337.

Baker, C. L., Lincoln, F. J. & Johnson, A. W. S. (1991) A low-temperature structural phase transformation in CuAgS. Acta Crystallographica, B47, 891-899.

Schmidt, J.A. and Sagua, A.E. (1993) Thermodynamic quantities for the ternary compound stromeyerite: (copper silver sulfide) Cu1+dAg1-dS for 0≤d≤0.1. Journal of Chemical Thermodynamics 25: 1453-1459.

Trots, D. M.; Senyshyn, A.; Mikhailova, D. A.; Knapp, M.; Bähtz, C.; Hölzel, M.; Fuess, H. (2007) High-temperature thermal expansion and structural behaviour of stromeyerite, AgCuS. Journal of Physics: Condensed Matter 19, 136204/1-136204/13.

Asadov, Yu. G.; Alyev, Yu. I.; Jafarov, K. M. (2008) X-ray diffraction study of compounds in the Ag2S-Cu2S system. Inorganic Materials 44, 460-466.

Tokuhara, Y., Tezuka, K., Shan, Y. J. and Imoto, H. (2009) Syntheses of complex sulfides AgCuS and Ag3CuS2 from the elements under hydrothermal conditions. Journal of the Ceramic Society of Japan, 117, 359-362 (in Japanese).

Internet Links for Stromeyerite

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Specimens:
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Localities for Stromeyerite

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