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|System:||Orthorhombic||Hardness:||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
|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:||18.104.22.168|
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
|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 Å³ (Calculated from Unit Cell)|
Chemical Properties of Larosite
|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):|
|Related Minerals - Hey's Index Grouping:|
Other Names for Larosite
|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
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
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.
(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.
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