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MINERAL CLASSIFICATION / SYSTEMATIK der MINERALE

           based on E.H. Nickel & M.C. Nichols (2009), H. Strunz & E.H. Nickel (2001),
           revised by Thomas Witzke (2023)



2. SULFIDES and SULFOSALTS
(Sulfides, Selenides, Tellurides, Arsenides, Antimonides, Bismuthides, Sulfarsenites, Sulfantimonites, Sulfbismuthites, etc.)


2.O: Sulfides etc. with Halides


2.OA. Sulfides with Cl, Br, I (Halide-Sulfide)
 
2.OA.005. Corderoite
 
Corderoite Hg3S2Cl2 cub., I213 FOTO IMA 1973-037

 
2.OA.010. Lavrentievite
 
Lavrentievite Hg3S2(Cl,Br)2 mon., P2/m (?) IMA 1984-020

Arzakite, Hg3S2(Br,Cl)2, mon., P2/m (?), described without IMA approval.

 
2.OA.015. Kenhsuite
 
Kenhsuite Hg3S2Cl2 orth., A2mm IMA 1996-026

 
2.OA.020. Grechishchevite
 
Grechishchevite Hg3S2(Br,Cl,I)2 tetr., P4/mmm IMA 1988-027

 
2.OA.025. Radtkeite
 
Radtkeite Hg3S2ClI orth., Fmmm (?) IMA 1989-030

 
2.OA.030. Capgaronnite
 
Capgaronnite HgAgS(Cl,Br) orth., P21212 FOTO IMA 1990-011

 
2.OA.035. Iltisite
 
Iltisite HgAgS(Cl,Br) hex. FOTO IMA 1994-031

 
2.OA.040. Hanauerite
 
Hanauerite HgAgSI orth., Pmma IMA 2018-045

 
2.OA.045. Perroudite
 
Perroudite Hg5Ag4S5(I,Br)2Cl2 orth., P21212 FOTO IMA 1986-035

 
2.OA.050. Demicheleite group
 
Demicheleite-(Cl) BiSCl orth., Pnma IMA 2008-020
Demicheleite-(Br) BiSBr orth., Pnma IMA 2007-022
Demicheleite-(I) BiSI orth., Pnma IMA 2009-049



 
 
2.OB. Tellurides with Cl, Br, I (Halide-Tellurides)
 
2.OB.005. Kolarite
 
Kolarite PbTeCl2 orth., Pmmm (?) IMA 1983-081

The crystal structures of kolarite and radhakrishnaite are not known, their classification is therefore problematic. In Strunz 9 they were placed in the order 3.AA. Simple Halides without water, but from the atomic ratios it is obvious that they does not fit into a simple cation-anion scheme. Both minerals are grouped therefore here tentatively as Telluride-Chlorides in the Sulfide (etc.)-Halide subclass.


 
2.OB.010. Radhakrishnaite
 
Radhakrishnaite PbTe3Cl2 tetr. FOTO IMA 1983-082



 
 

G = Grandfathered minerals: original description preceded the establishment of the CNMNC in 1959, and generally regarded as a valid species
A or IMA No. = Minerals approved by the CNMNC
Rd = Redefinition of the mineral approved by the CNMNC
Rn = Renamed with approval by the CNMNC
Q = Questionable mineral



Classification principles:
Subdivision of the Sulfide etc. subclass "2.O: Sulfides with Halides" into 2.OA Sulfides with Cl, Br, I (Halide-Sulfide); 2.OB Tellurides with Cl, Br, I (Halide-Tellurides).

Further classification:
2.OA. Sulfides with Cl, Br, I (Halide-Sulfide): Halide-Sulfides with Hg; halide-sulfides with Hg and Ag; halide-sulfides with Bi.
2.OB. Tellurides with Cl, Br, I (Halide-Tellurides): Only two minerals.


To distinguish from classical Strunz numbering, on hierarchical "group" level, a numbering with 3 digits is used, like "2.OA.005. Corderoite", instead of 2 digits (like "2.OA.05.") in the Strunz system.


© Thomas Witzke (2023)


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