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MINERAL CLASSIFICATION / SYSTEMATIK der MINERALE

           according to 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 FOTOG
Ericaite Fe3B7O13Cl orth., Pca21 FOTOG
Chambersite Mn3B7O13Cl orth., Pca21 A

 
6.GA.10. Trembathite group
 
Trembathite Mg3B7O13Cl trig., R-3c IMA 1991-018
Congolite Fe3B7O13Cl trig., R-3c IMA 1971-030





 
6.GB. Phyllo-nonaborates, etc.
 
6.GB.05. Studenitsite group (4 Δ + 5 Tetrahedra)
 
Studenitsite NaCa2B9O14(OH)4 2 H2O mon., P21/c IMA 1994-026

 
6.GB.10. Penobsquisite group (4 Δ + 5 Tetrahedra)
 
Penobsquisite Ca2FeB9O13(OH)6Cl 4 H2O mon., P21 IMA 1995-014

 
6.GB.15. Preobrazhenskite group (4 Δ + 5 Tetrahedra + 2 Tetrahedra)
 
Preobrazhenskite Mg3B11O15(OH)9 orth., Pbcn G

 
6.GB.20. Walkerite group
 
Walkerite Ca3(Mg,Li)2(B13O17(OH)12)4Cl6 28 H2O orth., Pba2 IMA 2001-051





 
6.GC. Tekto-dodecaborates, etc.
 
6.GC.05. Rhodizite group (12 Tetrahedra)
 
Rhodizite KAl4Be4B11BeO24O4 cub., P-43m G
Londonite CsAl4Be4B11BeO24O4 cub., P-43m IMA 1999-014





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

 
6.GD.10. Metaborite group
 
Metaborite HBO2 cub., P-43n A
Metaborite HBO2 mon., P21/a A





in bold: grandfathered, IMA accepted, renamed and redefined (with IMA approval) minerals,
in normal letters: minerals published without IMA approval, questionable minerals, polytypes


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
GROUP = a name used to designate a group of species
N = Mineral published without approval of the CNMNC
Q = Questionable mineral
H = Hypothetical mineral (synthetic, anthropogenic, etc.)
D = Discredited by the CNMNC
Poly = Polytype



© Thomas Witzke / Stollentroll (2007-2010)


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