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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: Heptaborates and other Megaborates


6.GA. Tekto-heptaborates
 
6.GA.05. Boracite group
 
Boracite Mg3B7O13Cl orth., Pca21 FOTO G
Ericaite Fe3B7O13Cl orth., Pca21 FOTO G
Chambersite Mn3B7O13Cl orth., Pca21 A


 
6.GA.10. Trembathite group
 
Trembathite Mg3B7O13Cl trig., R3c IMA 1991-018
Congolite Fe3B7O13Cl trig., R3c IMA 1971-030



 
 
6.GB. Phyllo-octaborates, Phyllo-nonaborates, etc.
 
6.GB.05. Strontioborite (5 Δ + 3 Tetrahedra)
 
Strontioborite SrB8O11(OH)4 mon., P21 IMA 2020-017


 
6.GB.10. Studenitsite (4 Δ + 5 Tetrahedra)
 
Studenitsite NaCa2B9O14(OH)4·2H2O mon., P21/c IMA 1994-026


 
6.GB.15. Penobsquisite (4 Δ + 5 Tetrahedra)
 
Penobsquisite Ca2FeB9O13(OH)6Cl·4H2O mon., P21 IMA 1995-014


 
6.GB.20. Preobrazhenskite (4 Δ + 5 Tetrahedra + 2 Tetrahedra)
 
Preobrazhenskite Mg3B11O15(OH)9 orth., Pbcn G


 
6.GB.25. Walkerite
 
Walkerite Ca3(Mg,Li)2(B13O17(OH)12)4Cl6·28H2O orth., Pba2 IMA 2001-051


 
6.GB.30. Satimolite (6 Δ + 6 Tetrahedra in 12-membered rings)
 
Satimolite KNa2(Al5Mg2)[B12O18(OH)12](OH)6Cl4·4H2O trig., R3 IMA 1967-023



 
 
6.GC. Tekto-dodecaborates, etc.
 
6.GC.05. Rhodizite group (12 Tetrahedra)
 
Rhodizite KAl4Be4(B11Be)O24O4 cub., P43m G
Londonite CsAl4Be4(B11Be)O24O4 cub., P43m FOTO IMA 1999-014



 
 
6.GD. Mega-Tektoborates
 
6.GD.05. Pringleite group (12 Δ + 14 Tetrahedra)
 
Pringleite Ca9B26O34(OH)24Cl4·13H2O tric., P1 IMA 1992-010
Ruitenbergite Ca9B26O34(OH)24Cl4·13H2O mon., P21 IMA 1992-011


 
6.GD.10. Metaborite group
 
Metaborite HBO2 cub., P43n A
Clinometaborite HBO2 mon., P21/a A



 
 

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


© Thomas Witzke (2007-2020)


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