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Alloclasite

Formula:
(Co
 
0.65
Fe
 
0.35
)AsS - CoAsS
System:MonoclinicColour:White
Lustre:MetallicHardness:5


See also the chemically very similar Cobaltite and Glaucodot.

Classification of Alloclasite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered" 1866
Strunz 8th edition ID:2/D.22-60
Nickel-Strunz 10th (pending) edition ID:2.EB.15

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
E : Metal Sulfides, M: S <= 1:2
B : M:S = 1:2, with Fe, Co, Ni, PGE, etc.
Dana 8th edition ID:2.12.6.2

2 : SULFIDES
12 : AmBnXp, with (m+n):p = 1:2
Hey's CIM Ref.:3.10.16

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

Type Locality:Elizabeth Mine, Oraviţa (Oravicza), Caras-Severin Co., Romania
Year of Discovery:1866

Physical Properties of Alloclasite

Lustre:Metallic
Colour:White
Hardness (Mohs):5

Crystallography of Alloclasite

Crystal System:Monoclinic

Chemical Properties of Alloclasite

Formula:
(Co
 
0.65
Fe
 
0.35
)AsS - CoAsS
Essential elements:As, Co, S
All elements listed in formula:As, Co, Fe, S
Common Impurities:Ni

Relationship of Alloclasite to other Species

Related Minerals - Nickel-Strunz Grouping):
2.EB.05Aurostibite
AuSb
 
2
2.EB.05Bambollaite
Cu(Se,Te)
 
2
2.EB.05Cattierite
CoS
 
2
2.EB.05Erlichmanite
OsS
 
2
2.EB.05Fukuchilite
Cu
 
3
FeS
 
8
2.EB.05Geversite
PtSb
 
2
2.EB.05Hauerite
MnS
 
2
2.EB.05Insizwaite
Pt(Bi,Sb)
 
2
2.EB.05Krut'aite
CuSe
 
2
2.EB.05Laurite
RuS
 
2
2.EB.05Penroseite
(Ni,Co,Cu)Se
 
2
2.EB.05Pyrite
FeS
 
2
2.EB.05Sperrylite
PtAs
 
2
2.EB.05Trogtalite
CoSe
 
2
2.EB.05Vaesite
NiS
 
2
2.EB.05Villamanínite
(Cu,Ni,Co,Fe)S
 
2
2.EB.05Dzharkenite
FeSe
 
2
2.EB.05Gaotaiite
Ir
 
3
Te
 
8
2.EB.10Ferroselite
FeSe
 
2
2.EB.10Frohbergite
FeTe
 
2
2.EB.10Hastite
CoSe
 
2
2.EB.10Kullerudite
NiSe
 
2
2.EB.10Marcasite
FeS
 
2
2.EB.10Mattagamite
CoTe
 
2
2.EB.15Anduoite
(Ru,Os)As
 
2
2.EB.15Clinosafflorite
(Co,Fe,Ni)As
 
2
2.EB.15Costibite
CoSbS
2.EB.15Krutovite
NiAs
 
2
2.EB.15Löllingite
FeAs
 
2
2.EB.15Nisbite
NiSb
 
2
2.EB.15Omeiite
(Os,Ru)As
 
2
2.EB.15Paracostibite
CoSbS
2.EB.15Pararammelsbergite
NiAs
 
2
2.EB.15Rammelsbergite
NiAs
 
2
2.EB.15Safflorite
(Co,Fe)As
 
2
2.EB.15Seinäjokite
(Fe,Ni)(Sb,As)
 
2
2.EB.15Oenite
CoSbAs
2.EB.20Arsenopyrite
FeAsS - (Fe
 
0.90
Co
 
0.10
)AsS
2.EB.20Glaucodot
(Fe
 
0.65
Co
 
0.35
)AsS - (Co
 
0.65
Fe
 
0.35
)AsS
2.EB.20Gudmundite
FeSbS
2.EB.20Osarsite
(Os,Ru)AsS
2.EB.20Paxite
CuAs
 
2
2.EB.20Ruarsite
(Ru,Os)AsS
2.EB.25Cobaltite
CoAsS
2.EB.25Gersdorffite
NiAsS
2.EB.25Hollingworthite
(Rh,Pt,Pd)AsS
2.EB.25Irarsite
(Ir,Ru,Rh,Pt)AsS
2.EB.25Jolliffeite
NiAsSe
2.EB.25Maslovite
PtBiTe
2.EB.25Michenerite
PdBiTe
2.EB.25Padmaite
PdBiSe
2.EB.25Platarsite
(Pt,Rh,Ru)AsS
2.EB.25Testibiopalladite
PdTe(Sb,Te)
2.EB.25Tolovkite
IrSbS
2.EB.25Ullmannite
NiSbS
2.EB.25Willyamite
(Co,Ni)SbS
2.EB.25Changchengite
IrBiS
2.EB.25Mayingite
IrBiTe
2.EB.25Hollingsworthite
2.EB.25Kalungaite
PdAsSe
2.EB.25Milotaite
PdSbSe
2.EB.30Urvantsevite
Pd(Bi,Pb)
 
2
2.EB.35Rheniite
ReS
 
2
Related Minerals - Hey's Index Grouping:
3.10.1Cobaltpentlandite
(Co,Ni,Fe)
 
9
S
 
8
3.10.2Linnaeite
Co
2+
 
Co
3+
2
S
 
4
3.10.3Cattierite
CoS
 
2
3.10.4Freboldite
CoSe
3.10.5Bornhardtite
Co
2+
 
Co
3+
2
Se
 
4
3.10.6Trogtalite
CoSe
 
2
3.10.7Hastite
CoSe
 
2
3.10.8Mattagamite
CoTe
 
2
3.10.9Modderite
(Co,Fe)As
3.10.10Safflorite
(Co,Fe)As
 
2
3.10.11Clinosafflorite
(Co,Fe,Ni)As
 
2
3.10.12Skutterudite
(Co,Fe,Ni)As
 
2-3
3.10.13Cobaltite
CoAsS
3.10.14Paracostibite
CoSbS
3.10.15Costibite
CoSbS
3.10.17Glaucodot
(Fe
 
0.65
Co
 
0.35
)AsS - (Co
 
0.65
Fe
 
0.35
)AsS
3.10.18Carrollite
Cu(Co,Ni)
 
2
S
 
4

Other Names for Alloclasite

Synonyms:
Alloclase
German names:
AlloclasitAlloklas
Russian names:
Аллоклазит
Spanish names:
Alloclasita

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 Alloclasite

Reference List:Tschermak (1866), A. Wien, Ber.: 53: 220.

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: 324.

Canadian Mineralogist 10 (1971), 838.

Canadian Mineralogist: (1971): 11: 150.

Canadian Mineralogist: (1976): 14: 561.

Anthony, Bideaux, Bladh & Nichols (1990), Handbook of Mineralogy, Vol. I: 10.

Canadian Mineralogist (2001): 39: 831.

Mineralogical Magazine (2002): 66: 385.

Internet Links for Alloclasite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Search for Alloclasite in the Natural History Museum (London) online catalogue
  • Alloclasite details from Handbook of Mineralogy (PDF)
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    Localities for Alloclasite

    Hide Locality List
    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.
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    (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.
    Argentina
     
    • La Rioja
    		Brodtkorb (2002): Especies Minerales de la Republica Argentina
    Australia
     
    • Queensland
    		[MinRec 19 p469-490 - "Sielecki, R: The Mount Isa-Cloncurry mineral field"]
    Bulgaria
     
    • Sofiya (Sofia) Oblast
      • Botevgrad
    Canada
     
    • Ontario
      • Timiskaming District
        • Cobalt-Gowganda region
          • Casey Township
    [www.ontariominerals.com]
        • Coleman Township
    Czech Republic
     
    • Bohemia (Böhmen; Boehmen)
      • Karlovy Vary Region
        • Krušné Hory Mts (Erzgebirge)
          • Ostrov
    		Lapis 2002(7/8), 63-65
    France
     
    • Provence-Alpes-Côte d'Azur
      • Hautes-Alpes
        • Lautaret pass area
    		R. Pierrot, P. Picot, P.A. Poulain, "Inventaire Minéralogique de la France : Hautes-Alpes", BRGM, 1972
    Germany
     
    • Baden-Württemberg
      • Black Forest
        • Pforzheim
          • Würm
    		Lapis, 18 (2), 13-24
        • Schenkenzell
          • Wittichen
            • Burgfelsen
    		No reference listed
        • Wolfach
          • Oberwolfach
            • Rankach valley
    		KOLITSCH, U. (1996): Cobaltit, Skutterudit und Alloklas von der Grube Clara bei Oberwolfach. - Erzgräber 10 (1), 56-59.
    • Hesse
      • Spessart Mts
        • Gelnhausen
          • Bieber
    		No reference listed
    • North Rhine-Westphalia
      • Siegerland
        • Eiserfeld
    		Wittern: "Mineralfundorte in Deutschland", 2001
        • Gosenbach
    		Wittern: "Mineralfundorte in Deutschland", 2001
    • Rhineland-Palatinate
      • Siegerland
        • Betzdorf
          • Schutzbach
    Ireland
     
    • Co. Kerry
      • Killarney
    		Moreton et al. (1998/9) Irish J. Earth Sciences, 17, 19-24.
    Japan
     
    • Honshu Island
      • Kinki Region
        • Nara Prefecture
    		No reference listed
    Morocco
     
    • Souss-Massa-Draâ Region
      • Ouarzazate Province
        • Tazenakht
    		S. Weiß: Lapis 31(7/8), 72-73 (2006)
    Romania
     
    • Caras-Severin Co.
      • Oraviţa (Oravicza)
    		Tschermak(1866); Can.Min.:11:150(1971) & 14:561(1976).
    Slovakia
     
    • Košice Region
      • Eastern Slovenské Rudohorie Mts
    		Pauliš,P.,Ďuďa,R.,2002: Nejzajímavejší mineralogická naletište Slovenska. Kuttna,K.Hora, 136p
    Spain
     
    • Andalusia
      • Huelva
    		Bocamina, (4), (1999) 50-86.
    UK
     
    • England
      • Cornwall
        • Mount's Bay District
          • Penzance - Ludgvan Area
            • Penzance
    		[Embrey & Symes, 1987, 39 - "Minerals of Cornwall and Devon"]
          • St Hilary
    		[UKJMM 20:7-37]
      • Cumbria
        • North and Western Region (Cumberland)
          • Braithwaite District
            • Causey Pike
              • Scar Crag
    		BMS Database
    USA
     
    • Arizona
      • Yavapai Co.
        • Mayer
    		Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 102.
    Mineral and/or Locality
    Google
     
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