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Larosite

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Formula:
(Cu,Ag)
 
21
(Pb,Bi)
 
2
S
 
13
System:OrthorhombicHardness:3 - 3½
Name:Named after Alfred LaRose (1870-1940), blacksmith and prospector who was one of the principal discoverers in 1903 of the rich silver deposits of the Cobalt area of northern Ontario, which led to a huge exploration and mining boom in the region. Two versions of the name are found in the literature, LaRose and Larose, the latter traditionally used by the family, but the former used in the naming of the mine.


Note: Electron microbe analyses of larosite from Norway (Cook et al., 2010) gave Cu20.47Ag3.68Fe0.22Pb1.01Bi1.06S15.00 calculated on the basis of 15 S atoms.

Classification of Larosite

IMA status:Approved
Strunz 8th edition ID:2/E.02-10
Nickel-Strunz 10th (pending) edition ID:2.LB.35

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
L : Unclassified Sulfosalts
B : With essential Pb
Dana 8th edition ID:2.16.9.1

2 : SULFIDES
16 : Miscellaneous
Hey's CIM Ref.:5.7.43

5 : Sulphosalts - Sulpharsenites and Sulphobismuthites (those containing Sn, Ge,or V are in Section 6)
7 : Sulpharsenites etc. of Pb and other metals
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Type Occurrence of Larosite

Type Locality:Foster Mine, Coleman Township, Cobalt area, Cobalt-Gowganda region, Timiskaming District, Ontario, Canada
Year of Discovery:1971

Physical Properties of Larosite

Hardness (Mohs):3 - 3½

Crystallography of Larosite

Crystal System:Orthorhombic
Cell Parameters:a = 22.15Å, b = 24.03Å, c = 11.67Å
Ratio:a:b:c = 0.922 : 1 : 0.486
Unit Cell Volume:V 6,211.53 ų (Calculated from Unit Cell)

Chemical Properties of Larosite

Formula:
(Cu,Ag)
 
21
(Pb,Bi)
 
2
S
 
13
Essential elements:Cu, Pb, S
All elements listed in formula:Ag, Bi, Cu, Pb, S

Relationship of Larosite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
2.LB.05Miharaite
Cu
 
4
FePbBiS
 
6
2.LB.30Ardaite
Pb
 
19
Sb
 
13
S
 
35
Cl
 
7
2.LB.30Launayite
Pb
 
22
Sb
 
26
S
 
61
2.LB.30Madocite
Pb
 
17
Sb
 
16
S
 
41
2.LB.30Playfairite
Pb
 
16
Sb
 
18
S
 
43
2.LB.30Sorbyite
CuPb
 
9
(Sb,As)
 
11
S
 
26
2.LB.30Sterryite
Ag
 
2
Pb
 
10
(Sb,As)
 
12
S
 
29
2.LB.40Petrovicite
Cu
 
3
HgPbBiSe
 
5
2.LB.40Mazzettiite
Ag
 
3
HgPbSbTe
 
5
2.LB.45Crerarite
Pt
 
2-x
(Bi,Pb)
 
11
(S,Se)
 
11
Related Minerals - Hey's Index Grouping:

- +
5.7.1Seligmannite
PbCuAsS
 
3
5.7.2Bournonite
PbCuSbS
 
3
5.7.3Meneghinite
Pb
 
13
CuSb
 
7
S
 
24
5.7.4Gladite
PbCuBi
 
5
S
 
9
5.7.5Lindströmite
Pb
 
3
Cu
 
3
Bi
 
7
S
 
15
5.7.6Krupkaite
PbCuBi
 
3
S
 
6
5.7.7Hammarite
Pb
 
2
Cu
 
2
Bi
 
4
S
 
9
5.7.8Friedrichite
Pb
 
5
Cu
 
5
Bi
 
7
S
 
18
5.7.9Aikinite
PbCuBiS
 
3
5.7.10Nuffieldite
Pb
 
2
Cu(Pb,Bi)Bi
 
2
S
 
7
5.7.11Jaskólskiite
Pb
 
2+x
Cu
 
x
(Sb,Bi)
 
2-x
S
 
6
 (x = 0.2)
5.7.12Tintinaite
Pb
 
22
Cu
 
4
(Sb,Bi)
 
30
S
 
69
5.7.13Kobellite
Pb
 
22
Cu
 
4
(Bi,Sb)
 
30
S
 
69
5.7.14Proudite
CuPb
 
7.5
Bi
 
9.33
(S,Se)
 
22
5.7.15Nordströmite
CuPb
 
3
Bi
 
7
(Se
 
4
S
 
10
)
5.7.16Watkinsonite
Cu
 
2
PbBi
 
4
(Se,S,Te)
 
8
5.7.17Pekoite
PbCuBi
 
11
(S,Se)
 
18
5.7.18Petrovicite
Cu
 
3
HgPbBiSe
 
5
5.7.19Eclarite
(Cu,Fe)Pb
 
9
Bi
 
12
S
 
28
5.7.20Marrite
AgPbAsS
 
3
5.7.21Baumhauerite-2a
Pb
 
11
Ag(As,Sb)
 
18
S
 
36
5.7.22Andorite
PbAgSb
 
3
S
 
6
5.7.23Ramdohrite
(Cd,Mn,Fe)Ag
 
5.5
Pb
 
12
Sb
 
21.5
S
 
48
5.7.24Roshchinite
Ag
 
19
Pb
 
10
Sb
 
51
S
 
96
5.7.25Ourayite
Ag
 
3
Pb
 
4
Bi
 
5
S
 
13
5.7.26Eskimoite
Ag
 
7
Pb
 
10
Bi
 
15
S
 
36
5.7.27Fizélyite
Ag
 
5
Pb
 
14
Sb
 
21
S
 
48
5.7.28Owyheeite
Ag
 
3+x
Pb
 
10-2x
Sb
 
11+x
S
 
28
, -0.13 < x > +0.20
5.7.29Freieslebenite
AgPbSbS
 
3
5.7.30Diaphorite
Ag
 
3
Pb
 
2
Sb
 
3
S
 
8
5.7.31Sterryite
Ag
 
2
Pb
 
10
(Sb,As)
 
12
S
 
29
5.7.32Vikingite
Ag
 
5
Pb
 
8
Bi
 
13
S
 
30
5.7.33Zoubekite
AgPb
 
4
Sb
 
4
S
 
10
5.7.34Schirmerite
AgPb
 
2
Bi
 
3
S
 
7
5.7.36Gustavite
Ag
 
3
Pb
 
5
Bi
 
11
S
 
24
5.7.37Kitaibelite
Ag
 
10
PbBi
 
30
S
 
51
5.7.38Treasurite
Ag
 
7
Pb
 
6
Bi
 
15
S
 
32
5.7.39Benjaminite
(Ag,Cu)
 
3
(Bi,Pb)
 
7
S
 
12
5.7.40Lengenbachite
(Ag,Cu)
 
2
Pb
 
6
As
 
4
S
 
13
5.7.41Berryite
Pb
 
3
(Ag,Cu)
 
5
Bi
 
7
S
 
16
5.7.42Neyite
Ag
 
2
Cu
 
6
Pb
 
25
Bi
 
26
S
 
68
5.7.44Cupropavonite
AgCu
 
2
PbBi
 
5
S
 
10
5.7.45Padĕraite
Cu
 
5.9
Ag
 
1.3
Pb
 
1.6
Bi
 
11.2
S
 
22
5.7.46Rayite
Pb
 
8
(Ag,Tl)
 
2
Sb
 
8
S
 
21
5.7.47Rathite
Pb
 
8
Pb
 
4-x
(Tl
 
2
As
 
2
)
 
x
(Ag
 
2
As
 
2
)As
 
16
S
 
40
5.7.48Hatchite
AgTlPbAs
 
2
S
 
5

Other Names for Larosite

Synonyms:
IMA1971-014
Other Languages:
German:Larosit
Simplified Chinese:及硫铅铜矿
Spanish:Larosita

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 Larosite

Reference List:

- +
PETRUK, W. (1972): Larosite, a new copper-lead-bismuth sulphide. Canadian Mineralogist 11, 886-891. Abstracted in: American Mineralogist (1974): 59, 382.
Cook, N.J. Ciobanu, C.L., Pedersen, Ø.S. Langerud, T.H. and Karlsen, O.A. (2010): A new occurrence of larosite from the Tinnsjå Cu–Ag deposit, Telemark county, Norway. I. paragenesis and chemical composition. Can. Mineral. 48, 1569-1573.

Internet Links for Larosite

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    • Localities for Larosite

    The 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.
    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.
    Canada
     
    • Ontario
      • Timiskaming District
        • Cobalt-Gowganda region
          • Cobalt area
            • Coleman Township
    		Can.Min.(1972) 11, 886-891 (and p. 209); Dana 7:I:343.
    China
     
    • Guangdong Province
      • Meizhou Prefecture
        • Mei Co.
    		Binghui Chen, Rui Guo, and Shouyun Yu (1994): Geology and Prospecting 30(3), 20-25
    • Henan Province
      • Luoyang Prefecture
        • Song Co.
          • Qiyugou ore field
    		Shihua Li and Jinzhong Qi (2000): Gold Geology 19(2)
    Norway
     
    • Telemark
      • Tinn
        • Tinnsjå (Tinnsjø; Lake Tinn)
    		Nigel J. Cook, Cristiana L. Ciobanu, Øyvind S. Pedersen, Thor H. Langerud, and Ove A. Karlsen (2010): A new occurrence of larosite from the Tinnsjå Cu–Ag deposit, Telemark county, Norway. I. paragenesis and chemical composition. Can. Mineral. 48, 1569-1573.
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