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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 (2022)



3. HALIDES
(Fluorides, Chlorides, Bromides, Iodides)


3.A: Simple Halides, without H2O


3.AA. Simple Halides, M : X = 1 : 1, 2 : 3 and related ratios
 
3.AA.005. Nantokite group
 
Nantokite CuCl cub., F43m G
Marshite CuI cub., F43m G
Miersite AgI cub., F43m G


 
3.AA.010. Iodargyrite
 
Iodargyrite AgI hex., P63/mc FOTO A
Tocornalite (Ag,Hg)I Q

The existence of Tocornalite as a mineral is very questionable.


 
3.AA.015. Chlorargyrite group
 
Chlorargyrite AgCl cub., Fm3m FOTO A
Bromargyrite AgBr cub., Fm3m FOTO A


 
3.AA.020. Halite group
 
Griceite LiF cub., Fm3m FOTO IMA 1986-043
Villiaumite NaF cub., Fm3m FOTO G
Carobbiite KF cub., Fm3m G
Halite NaCl cub., Fm3m FOTO G
Sylvite KCl cub., Fm3m FOTO G


 
3.AA.025. Salammoniac group
 
Salammoniac  /  Salmiak NH4Cl cub., Pm3m FOTO G
Lafossaite TlCl cub., Pm3m FOTO IMA 2003-043


 
3.AA.030. Nataliyamalikite
 
Nataliyamalikite TlI orth., Cmcm IMA 2016-022


 
3.AA.035. Calomel group
 
Calomel HgCl tetr., I4/mmm FOTO G
Kuzminite HgBr tetr., I4/mmm IMA 1986-005
Moschelite HgI tetr., I4/mmm IMA 1987-038


 
3.AA.040. Brontesite
 
Brontesite (NH4)3PbCl5 orth., Pnma IMA 2008-039


 
3.AA.045. Flinteite
 
Flinteite K2ZnCl4 orth., Pna21 IMA 2014-009


 
3.AA.050. Pseudocotunnite
 
Pseudocotunnite K2PbCl4 (?) orth. Q


 
3.AA.055. Mellizinkalite
 
Mellizinkalite K3Zn2Cl7 tric., P1 IMA 2014-010


 
3.AA.060. Neighborite group [Perovskite supergroup, Single Perovskites ABX3, Neighborite subgroup]
 
Neighborite NaMgF3 orth., Pcmn A
Parascandolaite KMgF3 cub., Pm3m IMA 2013-092


 
3.AA.065. Chlorocalcite [Perovskite supergroup, Single Perovskites ABX3, Chlorocalcite subgroup]
 
Chlorocalcite KCaCl3 orth., Pnma G


 
3.AA.070. Javorieite
 
Javorieite KFeCl3 orth., Pnma IMA 2016-020


 
3.AA.075. Sanguite
 
Sanguite KCuCl3 mon., P21/c IMA 2013-002


 
3.AA.080. Challacolloite group
 
Challacolloite KPb2Cl5 mon., P21/c FOTO IMA 2004-028
Hephaistosite TlPb2Cl5 mon., P21/c IMA 2006-043



 
 
3.AB. Simple Halides, M : X = 1 : 2
 
3.AB.005. Sellaite
 
Sellaite MgF2 tetr., P42/mnm FOTO G


 
3.AB.010. Lawrencite group
 
Chloromagnesite MgCl2 trig., R3m Q
Lawrencite FeCl2 trig., R3m FOTO G
Scacchite MnCl2 trig., R3m G

The existence of chloromagnesite as a mineral is very questionable.
Scacchite needs confirmation too.


 
3.AB.015. Tolbachite
 
Tolbachite CuCl2 mon., C2/m FOTO IMA 1982-067


 
3.AB.020. Fluorite group
 
Fluorite CaF2 cub., Fm3m FOTO G
Strontiofluorite SrF2 cub., Fm3m FOTO IMA 2009-014
Frankdicksonite BaF2 cub., Fm3m IMA 1974-015
Fluorocronite PbF2 cub., Fm3m IMA 2010-023


 
3.AB.025. Tveitite
 
Tveitite-(Y) Ca14Y5F43 trig., R3 IMA 1975-033


 
3.AB.030. Gagarinite group
 
Gagarinite-(Y) NaCaYF6 hex., P63/m FOTO A
Gagarinite-(Ce) NaCaCeF6 trig. IMA 1993-038, Rn, Rd
Polezhaevaite-(Ce) NaSrCeF6 hex., P63/m FOTO IMA 2009-015

Gagarinite-(Ce) was originally described as zajacite-(Ce), renamed in 2010.


 
3.AB.035. Coccinite
 
Coccinite HgI2 tetr., P42/nmc FOTO G


 
3.AB.040. Cotunnite
 
Cotunnite PbCl2 orth., Pnam FOTO G


 
3.AB.045. Matlockite group
 
Rorisite CaFCl tetr., P4/nmm FOTO IMA 1989-015
Zhangpeishanite BaFCl tetr., P4/nmm IMA 2006-045
Matlockite PbFCl tetr., P4/nmm FOTO G

Isostructural with the Bismoclite group (3.DD.15.).


 
3.AB.050. Laurelite
 
Laurelite Pb7F12Cl2 hex., P6 FOTO IMA 1988-020a

The crystal structure of Laurelite is related to the structure of orthorhombic α-PbF2.



 
 
3.AC. Simple Halides, M : X = 1 : 3
 
3.AC.005. Molysite
 
Molysite FeCl3 trig., R3 G


 
3.AC.010. Oskarssonite group [Perovskite supergroup, B site vacant Perovskites, Oskarssonite subgroup]
 
     010 a. Oskarssonite
Oskarssonite AlF3 trig., R3c IMA 2012-088
 
     010 b. Waimirite-(Y)
Waimirite-(Y) YF3 orth., Pnma IMA 2013108


 
3.AC.015. Fluocerite group
 
Fluocerite-(Ce) CeF3 trig., P3c1 A
Fluocerite-(La) LaF3 trig., P3c1 A


 
3.AC.020. Gananit
 
Gananite BiF3 cub., P43m FOTO IMA 1983-006






 
 

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 Halides subclass 3.A: Simple Halides, without water into 3.AA. Simple Halides, M : X = 1 : 1, 2 : 3 and related ratios; 3.AB. Simple Halides, M : X = 1 : 2; 3.AC. Simple Halides, M : X = 1 : 3 from Strunz 9 is retained.
Further classification:
3.AA.: Simple Halides, M : X = 1 : 1, 2 : 3 and related ratios : From M:X = 1:1 to 1:1.67 (=3:5) with increasing halide content, followed by Te containing halides with unknown structures. Within 1:1 ratio sorted roughly from medium-sized to large cations.
3.AB.: Simple Halides, M : X = 1 : 2 : Sorted from medium-sized to large cations.
3.AC.: Simple Halides, M : X = 1 : 3 : Sorted from medium-sized to large cations.


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


© Thomas Witzke (2023)


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