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Stromeyerite

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Alexander Mine, Vrančice, Příbram, Central Bohemia Region, Bohemia (Böhmen; Boehmen), Czech Republic
© Peter Haas

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Formula:
AgCuS
System:OrthorhombicColour:Blue gray, dark blue, ...
Lustre:MetallicHardness:2½ - 3
Name:
Named after the German chemist, Friedrich Stromeyer (1776-1835), professor of chemistry, university of Göttingen (Germany) who performed the first chemical analysis.
This page provides mineralogical data about Stromeyerite.

Classification of Stromeyerite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:2/B.06-30
Nickel-Strunz 10th (pending) edition ID: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
Dana 8th edition ID:2.4.6.1

2 : SULFIDES
4 : AmBnXp, with (m+n):p = 2:1
Hey's CIM Ref.: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
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Type Occurrence of Stromeyerite

Type Locality:Alexander Mine, Vrančice, Příbram, Central Bohemia Region, Bohemia (Böhmen; Boehmen), Czech Republic
Year of Discovery:1832
Geological Setting of type material:Copper- and silver-bearing veins, where silver replaces copper in bornite

Occurrences of Stromeyerite

Geological Setting:Hydrothermal veins (supergene enriched zone)

Physical Properties of Stromeyerite

Lustre: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 (measured):6.2 - 6.3 g/cm3
Density (calculated):6.33 g/cm3

Crystallography of Stromeyerite

Crystal System:Orthorhombic
Class (H-M):mmm (2/m 2/m 2/m) - Dipyramidal
Cell Parameters:a = 4.06Å, b = 6.62Å, c = 7.94Å
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}

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
Essential elements:Ag, Cu, S
All elements listed in formula:Ag, Cu, S
Common Impurities:Fe

Relationship of Stromeyerite to other Species

Common Associates:
FreibergiteBorniteChalcopyriteGalena
Related Minerals - Nickel-Strunz Grouping):

- +
2.BA.05Chalcocite
Cu
 
2
S
2.BA.05Djurleite
Cu
 
31
S
 
16
2.BA.05Geerite
Cu
 
8
S
 
5
2.BA.05Roxbyite
Cu
 
9
S
 
5
2.BA.10Anilite
Cu
 
7
S
 
4
2.BA.10Digenite
Cu
 
9
S
 
5
2.BA.15Bornite
Cu
 
5
FeS
 
4
2.BA.20Bellidoite
Cu
 
2
Se
2.BA.20Berzelianite
Cu
 
2
Se
2.BA.25Athabascaite
Cu
 
5
Se
 
4
2.BA.25Umangite
Cu
 
3
Se
 
2
2.BA.30Rickardite
Cu
 
7
Te
 
5
2.BA.30Weissite
Cu
 
2-x
Te
2.BA.35Acanthite
Ag
 
2
S
2.BA.35Argentite
2.BA.40Mckinstryite
(Ag,Cu)
 
2
S
2.BA.40dUM2003-13
Ag
 
6
AuCu
 
2
S
 
5
2.BA.45Jalpaite
Ag
 
3
CuS
 
2
2.BA.45Selenojalpaite
Ag
 
3
CuSe
 
2
2.BA.50Eucairite
AgCuSe
2.BA.55Aguilarite
Ag
 
4
SeS
2.BA.55Naumannite
Ag
 
2
Se
2.BA.60Cervelleite
Ag
 
4
TeS
2.BA.60Hessite
Ag
 
2
Te
2.BA.60Chenguodaite
Ag
 
9
Fe
3+
 
Te
 
2
S
 
4
2.BA.65Henryite
Ag
 
3
Cu
 
4
Te
 
4
2.BA.65Stützite
Ag
 
5-x
Te
 
3
, x = 0.24-0.36
2.BA.70Argyrodite
Ag
 
8
GeS
 
6
2.BA.70Canfieldite
Ag
 
8
(Sn,Ge)(S,Te)
 
6
2.BA.70Putzite
(Cu
 
4.7
Ag
 
3.3
)GeS
 
6
2.BA.75Fischesserite
Ag
 
3
AuSe
 
2
2.BA.75Penzhinite
(Ag,Cu)
 
4
Au(S,Se)
 
4
2.BA.75Petrovskaite
AuAg(S,Se)
2.BA.75Petzite
Ag
 
3
AuTe
 
2
2.BA.75Uytenbogaardtite
Ag
 
3
AuS
 
2
2.BA.80Bezsmertnovite
(Au,Ag)
 
4
Cu(Te,Pb)
2.BA.80Bilibinskite
PbCuAu
 
3
Te
 
2
2.BA.80Bogdanovite
(Au,Te,Pb)
 
3
(Cu,Fe)
Related Minerals - Hey's Index Grouping:

- +
3.2.1Acanthite
Ag
 
2
S
3.2.3Naumannite
Ag
 
2
Se
3.2.4Aguilarite
Ag
 
4
SeS
3.2.5Hessite
Ag
 
2
Te
3.2.6Empressite
AgTe
3.2.7Stützite
Ag
 
5-x
Te
 
3
, x = 0.24-0.36
3.2.8Cervelleite
Ag
 
4
TeS
3.2.9Dervillite
Ag
 
2
AsS
 
2
3.2.11Mckinstryite
(Ag,Cu)
 
2
S
3.2.12Jalpaite
Ag
 
3
CuS
 
2
3.2.13Eucairite
AgCuSe
3.2.14Cameronite
AgCu
 
7
Te
 
10
3.2.15Henryite
Ag
 
3
Cu
 
4
Te
 
4
3.2.16Sternbergite
AgFe
 
2
S
 
3
3.2.17Argentopyrite
AgFe
 
2
S
 
3
3.2.18Geffroyite
(Cu,Fe,Ag)
 
9
(Se,S)
 
8
3.2.19Argentopentlandite
Ag(Fe,Ni)
 
8
S
 
8

Other Names for Stromeyerite

Synonyms:
CypargyriteStromeyerine
Other Languages:
German:Kupfersilberglanz
Stromeyerit
Russian:Штромейерит
Spanish:Stromeyerita

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 Stromeyerite

Reference List: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, 834pp.: 190-191.

Zeitschrift für Kristallographie (1955): 106: 299.

Economic Geology (1966): 61: 1.

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.

Internet Links for Stromeyerite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
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  • Stromeyerite details from Handbook of Mineralogy (PDF)
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    Localities for Stromeyerite

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