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Safflorite

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Formula:
CoAs
 
2
May contain Fe and/or Ni replacing Co.
System:OrthorhombicColour:Tin-white, tarnishing to ...
Hardness:4½ - 5
Member of:Löllingite Group
Name:Named in 1835 by Johann Friedrich August Breithaupt from German, Safflor or Zaffer because it was used in the manufacture of zaffer, an impure oxide of cobalt used as pigment.
Dimorph of:Clinosafflorite
Isostructural with:Marcasite

Classification of Safflorite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:2/D.23-20
Nickel-Strunz 10th (pending) edition ID:2.EB.15a

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:2.12.2.11

2 : SULFIDES
12 : AmBnXp, with (m+n):p = 1:2
Hey's CIM Ref.:3.10.10

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 Safflorite

Type Locality:Daniel Mine (St. Daniel Mine), Neustädtel, Schneeberg District, Erzgebirge, Saxony, Germany
Year of Discovery:1817

Occurrences of Safflorite

Geological Setting:In moderate temperature hydrothermal veins

Physical Properties of Safflorite

Lustre:Metallic
Diaphaneity (Transparency):Opaque
Colour:Tin-white, tarnishing to dark grey
Streak:Grayish black
Hardness (Mohs):4½ - 5
Hardness (Vickers):VHN100=792 - 882 kg/mm2
Tenacity:Brittle
Cleavage:Distinct/Good
Distinct on {100}
Fracture:Irregular/Uneven, Conchoidal
Density (measured):7.2 g/cm3
Density (calculated):7.471 g/cm3

Crystallography of Safflorite

Crystal System:Orthorhombic
Class (H-M):mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:Pnnm
Cell Parameters:a = 5.173Å, b = 5.954Å, c = 2.999Å
Ratio:a:b:c = 0.869 : 1 : 0.504
Unit Cell Volume:V 92.37 ų (Calculated from Unit Cell)
Z:2
Morphology:Prismatic Crystals
Twinning:As fivelings on {011}, Twin plane {101}
Crystal Atlas:
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Safflorite no.5 - Goldschmidt (1913-1926)

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Optical Data of Safflorite

Type:Anisotropic
Anisotropism:Strong
Colour in reflected light:White
Pleochroism:Weak

Chemical Properties of Safflorite

Formula:
CoAs
 
2


May contain Fe and/or Ni replacing Co.
Simplified for copy/paste:CoAs2
Essential elements:As, Co
All elements listed in formula:As, Co
Common Impurities:Cu,Ni,S

Relationship of Safflorite to other Species

Member of:Löllingite Group
Other Members of Group:

- +
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.05aVillamaninite
(Cu,Ni,Co,Fe)S
 
2
2.EB.05aDzharkenite
FeSe
 
2
2.EB.05aGaotaiite
Ir
 
3
Te
 
8
2.EB.10bAlloclasite
Co
 
1-x
Fe
 
x
AsS
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
CoAs
 
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.15bSeinäjokite
(Fe,Ni)(Sb,As)
 
2
2.EB.20Arsenopyrite
FeAsS
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
PtAsS
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
3.10.8Mattagamite
CoTe
 
2
3.10.9Modderite
(Co,Fe)As
3.10.11Clinosafflorite
CoAs
 
2
3.10.12Skutterudite
(Co,Fe,Ni)As
 
2-3
3.10.13Cobaltite
CoAsS
3.10.14Paracostibite
CoSbS
3.10.15Costibite
CoSbS
3.10.16Alloclasite
Co
 
1-x
Fe
 
x
AsS
3.10.17Glaucodot
(Co
 
0.50
Fe
 
0.50
)AsS
3.10.18Carrollite
Cu(Co,Ni)
 
2
S
 
4

Other Names for Safflorite

Synonyms:
Cobalt-Löllingite
Other Languages:
German:Arsenikkobalteisen
Arsenkobalteisen
Asenikkobalt
Eisenkobaltkies
Eisenspeiskobalt
Grauer Speiskobalt
Safflorit
Italian:Safflorite
Japanese:サフロ鉱
Russian:Саффлорит
Simplified Chinese:斜方砷钴矿
Spanish:Safflorita

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 Safflorite

Reference List:

- +
Breithaupt, A. (1817): Strahliger Weisser Speiskobold.- C.A.S. Hoffmann´s Handbuch der Mineralogie, Vol. 4.1.- Freiberg, Verl. Craz & Gerlach, p. 181-182.

Breithaupt, A. (1835), Journal für praktische Chemie 4, 265.

Flink (1908) Ark. Kemi: 3(11): 73.

Buerger (1937), American Mineralogist: 22: 48.

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: 307-309.

Radcliffe, D. & Berry, L. G. (1968): Safflorite-loellingite solid solution series. American Minealogist 53, 1856-1881.

Canadian Mineralogist (1971): 10: 877-881.

Bulletin de Minéralogie: 89: 213-215.

Yang, H., Downs, R.T., Eichler, C. (2008): Safflorite, (Co,Ni,Fe)As2, isomorphous with marcasite. Acta Crystallographica, E64, i62.

Internet Links for Safflorite

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    Localities for Safflorite

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