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Selenojalpaite

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Formula:
Ag
 
3
CuSe
 
2
System:TetragonalColour:Dark grey
Hardness:4 - 4½
This page provides mineralogical data about Selenojalpaite.

Classification of Selenojalpaite

IMA status:Approved 2004
Strunz 8th edition ID:2/B.06-15
Nickel-Strunz 10th (pending) edition ID:2.BA.45

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
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Type Occurrence of Selenojalpaite

Type Locality:Skrikerum Mine, Valdemarsvik, Östergötland, Sweden
General Appearance of Type Material:anhedral to subhedral grains up to 200 µm across
Associated Minerals at type locality:
EucairiteChalcopyriteBerzelianiteAltaite

Physical Properties of Selenojalpaite

Lustre:Metallic
Diaphaneity (Transparency):Opaque
Colour:Dark grey
Streak:Black
Hardness (Mohs):4 - 4½
Hardness (Vickers):VHN25=36 - 40 kg/mm2
Tenacity:Brittle
Fracture:Irregular/Uneven
Density (calculated):7.64 g/cm3

Crystallography of Selenojalpaite

Crystal System:Tetragonal
Class (H-M):4/mmm (4/m 2/m 2/m) - Ditetragonal Dipyramidal
Space Group:I41/amd {I41/a 2/m 2/d}
Cell Parameters:a = 8.939Å, c = 11.844Å
Ratio:a:c = 1 : 1.325
Unit Cell Volume:V 946.4 ų
Z:8
X-Ray Powder Diffraction:
d-spacingIntensity
4.47 (60)
2.891 (85)
2.813 (80)
2.473 (75)
2.426 (100)
2.162 (70)
2.034 (65)
Comments:Format: d/A (I/%) (hkl)
From type description

Optical Data of Selenojalpaite

Type:Anisotropic
Bireflectance:Weakly to moderately bireflectant
Reflectivity:
471.1 nmR1=33.5%R2= 37.1%
548.3 nmR1=31.8%R2= 35.1%
586.6 nmR1=30.4%R2= 34.0%
652.3 nmR1=29.3%R2= 32.4%


Graph shows reflectance levels at different wavelengths (in nm). Peak reflectance is 37.1%.
R1 shown in black, R2 shown in red
Colour in reflected light:Light grey
Internal Reflections:None
Pleochroism:Weak
Comments:Brownish grey to slightly darker greenish grey

Chemical Properties of Selenojalpaite

Formula:
Ag
 
3
CuSe
 
2
All elements listed in formula:Ag, Cu, Se
Analytical Data:Average results of 15 electron-microprobe analyses
Emprical formula calculated on the basis of six atoms in total
Ag 59.20%
Cu 11.81%
Se 29.01%

total 100.02%
Empirical Formula:
Ag
 
2.99
Cu
 
1.01
Se
 
2.00

Relationship of Selenojalpaite to other Species

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.40Mckinstryite
Ag
 
5-x
Cu
 
3+x
S
 
4
, x ~ 0-0.28
2.BA.40Stromeyerite
AgCuS
2.BA.40dUM2003-13-S:AgAuCu
Ag
 
6
AuCu
 
2
S
 
5
2.BA.45Jalpaite
Ag
 
3
CuS
 
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)

Other Names for Selenojalpaite

Synonyms:
IMA2004-048
Other Languages:
German:Selenojalpait

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 Selenojalpaite

Reference List:

- +
Bindi, L. & Pratesi, G. (2005): "Selenojalpaite, Ag3CuSe2, a new mineral species from the Skrikerum Cu–Ag–Tl selenide deposit, Smaland, southeastern Sweden", Canadian Mineralogist: 43: 1373-1377.

Internet Links for Selenojalpaite

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    • Localities for Selenojalpaite

    Hide Locality List
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Sweden
     
    • Östergötland
      • Valdemarsvik
    		L. Bindi & G. Pratesi (2005); Sandström, F. (2007): Skrikerum. Litiofilen 24 (1), 22-38
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