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Alloclasite

Formula:
(Co
 
0.65
Fe
 
0.35
)AsS - CoAsS
System:MonoclinicColour:Steel gray to silver
Lustre:MetallicHardness:5
Name:For the Greek "other" and "to break", because it's cleavage was believed to be different than marcasite.
Dimorph of:Glaucodot


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.10b

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), Oraviţa-Ciclova Cu-Mo-(W) ore field, Banat Mts, Caras-Severin Co., Romania
Year of Discovery:1866

Occurrences of Alloclasite

Geological Setting:In veins in low temperature hydrothermal veins. Metamorphic rock.

Physical Properties of Alloclasite

Lustre:Metallic
Diaphaneity (Transparency):Opaque
Colour:Steel gray to silver
Streak:Nearly black
Hardness (Mohs):5
Hardness (Vickers):VHN100=818 - 940 kg/mm2
Tenacity:Brittle
Cleavage:Perfect
perfect on {101}
distinct on {010}
Fracture:Irregular/Uneven, Sub-Conchoidal
Density (measured):5.95 g/cm3
Density (calculated):6.188 g/cm3

Crystallography of Alloclasite

Crystal System:Monoclinic
Class (H-M):2 - Sphenoidal
Space Group:P21 {P1 1 21} {P21} {P1 21 1}
Cell Parameters:a = 4.661Å, b = 5.602Å, c = 3.411Å
β = 90.03°
Ratio:a:b:c = 0.832 : 1 : 0.609
Unit Cell Volume:V 89.06 ų (Calculated from Unit Cell)
Z:2
Morphology:Prismatic, columnar to radiating aggregates.

Chemical Properties of Alloclasite

Formula:
(Co
 
0.65
Fe
 
0.35
)AsS - CoAsS
Essential elements:As, Co, Fe, 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.05aAurostibite
AuSb
 
2
2.EB.05bBambollaite
Cu(Se,Te)
 
2
2.EB.05aCattierite
CoS
 
2
2.EB.05aErlichmanite
OsS
 
2
2.EB.05aFukuchilite
Cu
 
3
FeS
 
8
2.EB.05aGeversite
PtSb
 
2
2.EB.05aHauerite
MnS
 
2
2.EB.05aInsizwaite
Pt(Bi,Sb)
 
2
2.EB.05aKrut'aite
CuSe
 
2
2.EB.05aLaurite
RuS
 
2
2.EB.05aPenroseite
(Ni,Co,Cu)Se
 
2
2.EB.05aPyrite
FeS
 
2
2.EB.05aSperrylite
PtAs
 
2
2.EB.05aTrogtalite
CoSe
 
2
2.EB.05aVaesite
NiS
 
2
2.EB.05aVillamanínite
(Cu,Ni,Co,Fe)S
 
2
2.EB.05aDzharkenite
FeSe
 
2
2.EB.05aGaotaiite
Ir
 
3
Te
 
8
2.EB.10dCostibite
CoSbS
2.EB.10aFerroselite
FeSe
 
2
2.EB.10aFrohbergite
FeTe
 
2
2.EB.10cGlaucodot
(Co
 
0.50
Fe
 
0.50
)AsS
2.EB.10aKullerudite
NiSe
 
2
2.EB.10aMarcasite
FeS
 
2
2.EB.10aMattagamite
CoTe
 
2
2.EB.10eParacostibite
CoSbS
2.EB.10ePararammelsbergite
NiAs
 
2
2.EB.10fOenite
CoSbAs
2.EB.15aAnduoite
(Ru,Os)As
 
2
2.EB.15aClinosafflorite
(Co,Fe,Ni)As
 
2
2.EB.15aLöllingite
FeAs
 
2
2.EB.15aNisbite
NiSb
 
2
2.EB.15aOmeiite
(Os,Ru)As
 
2
2.EB.15cPaxite
CuAs
 
2
2.EB.15aRammelsbergite
NiAs
 
2
2.EB.15aSafflorite
(Co,Fe,Ni)As
 
2
2.EB.15bSeinäjokite
(Fe,Ni)(Sb,As)
 
2
2.EB.20Arsenopyrite
FeAsS - (Fe
 
0.90
Co
 
0.10
)AsS
2.EB.20Gudmundite
FeSbS
2.EB.20Osarsite
(Os,Ru)AsS
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.25Krutovite
NiAs
 
2
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,Ni)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
(Co
 
0.50
Fe
 
0.50
)AsS
3.10.18Carrollite
Cu(Co,Ni)
 
2
S
 
4

Other Names for Alloclasite

Synonyms:
Alloclase
Other Languages:
German:Alloclasit
Alloklas
Russian:Аллоклазит
Spanish: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.

H. Yang and R.T. Downs (2008), Crystal structure of glaucodot, (Co,Fe)AsS, and its relationships to marcasite and arsenopyrite, American Mineralogist 93, 1183-1186.

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

    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.
    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
          • Cobalt
    Reiner Mielke (2009)
    Handbook of Mineralogy
        • Gowganda
    Handbook of Mineralogy
    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
    Kingstone (1971) Canadian Mineralogist, 10, 838-846.
        • Wakayama Prefecture
          • Otsuga-mura
            • Nishi-muro-gun
    Ohnishi et al (2004) Koubutsu-Gakkai Kou\'en-Youshi, 134.
    Morocco
     
    • Souss-Massa-Draâ Region
      • Ouarzazate Province
        • Tazenakht
    S. Weiß: Lapis 31(7/8), 72-73 (2006)
    Romania
     
    • Caras-Severin Co.
      • Banat Mts
        • Oraviţa-Ciclova Cu-Mo-(W) ore field
          • 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
        • Alosno
          • Tharsis
    Tornos, F., González Clavijo, E., and Spiro, B. (1998): Mineralium Deposita 33, 150-169.
        • Minas de Riotinto
    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; Handbook of Mineralogy
    USA
     
    • Alaska
      • Bethel Borough
        • McGrath District
    U.S. Geological Survey, 2008, Alaska Resource Data File (ARDF): U.S. Geological Survey Open-File Report 2008-1225.
    • Arizona
      • Yavapai Co.
        • Mayer
    Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 102.
    • Pennsylvania
      • Montgomery Co.
        • Marlborough Township
          • Perkiomenville
    Handbook of Mineralogy
    Mineral and/or Locality
    Google
     
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    Copyright © Jolyon Ralph and Ida Chau 1993-2009. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them.Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. If you would like to add information to improve the quality of our database, then click here to register. Current server date and time: 12th Nov 2009 14:09:12