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MINERAL CLASSIFICATION / SYSTEMATIK der MINERALE

           based on E.H. Nickel & M.C. Nichols (2009), H. Strunz & E.H. Nickel (2001)



6. BORATES



6.G: Unclassified borates


6.GA. Unclassified borates
 
6.GA.005. Korzhinskite
 
Korzhinskite CaB2O4·0.5H2O mon., P2/m A


 
6.GA.010. Ekaterinite
 
Ekaterinite Ca2B4O7(Cl,OH)2·2H2O hex., P6 IMA 1979-067


 
6.GA.015. Tertschite
 
Tertschite Ca4B10O19·20H2O mon. (?) Q


 
6.GA.020. Chelkarite
 
Chelkarite CaMgB3O4Cl2·7H2O orth., Pbca G


 
6.GA.025. Wardsmithite
 
Wardsmithite Ca5MgB24O42·30H2O hex. or ps.-hex. IMA 1967-030



 
 
6.GB. Unclassified borates with additional other anions
 
6.GB.005. Canavesite
 
Canavesite Mg2(HBO3)(CO3)·5H2O mon. FOTO IMA 1977-025


 
6.GB.010. Vitimite
 
Vitimite Ca6B14O19(SO4)(OH)14·H2O mon. IMA 2001-057


 
6.GB.015. Iquiqueite
 
Iquiqueite K3Na4MgB24O39(OH)(CrO4)·H2O trig., P31c FOTO IMA 1984-019

 






 
 

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:
The classification is based on the linkage of borate triangles (BO3), symbol Δ, and borate tetrahedra (BO4), symbol □, to form fundamental building blocks (FBB) (see in Grice et al., 1999). According to the polymerization of the borate groups the subdivision is made now into Neso-, Soro-, Cyclo-, Ino-, Phyllo- and Tecto-borates, adapted from the well-known subdivision of the Silicates class and following the recommendation in Mills et al. (2009) on the standardization of mineral group hierarchies.
Borate minerals with unknown crystal structure are listed in this subclass 6.G.:
6.GA. Unclassified borates: Ca borates; Ca-Mg borates.
6.GB. Unclassified borates with additional other anions: With additional carbonate; with sulfate; with chromate.


Reference:
Grice, J.D.; Burns, P.C. & Hawthorne, F.C. (1999): Borate Minerals. II. A hierarchy of structures based upon the borate fundamental building block. Can. Min. 37, 731-762.
Mills, S.J.; Hatert, F.; Nickel, E. & Ferraris, G. (2009): The standardisation of mineral group hierarchies: application to recent nomenclature proposals. Eur. J. Mineral. 21, 1073-1080.


To distinguish from classical Strunz numbering, on hierarchical "group" level, a numbering with 3 digits is used, like "6.GA.005. Korzhinskite", instead of 2 digits (like "6.GA.05.") in the Strunz system.



© Thomas Witzke (2024)


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