according to E.H. Nickel & M.C. Nichols (2009), H. Strunz & E.H. Nickel (2001)


6.E: Pentaborates

6.EA. Neso-pentaborates
6.EA.05. Sborgite group (4 Δ + 1 Tetrahedron)
Sborgite NaB5O6(OH)4 3 H2O mon., C2/c G

6.EA.10. Santite group (4 Δ + 1 Tetrahedron)
Santite KB5O6(OH)4 2 H2O orth., Aba2 IMA 1969-044
Ramanite-(Rb) RbB5O6(OH)4 2 H2O orth., Aba2 IMA 2007-006
Ramanite-(Cs) CsB5O6(OH)4 2 H2O mon., C2/c IMA 2007-006

6.EA.15. Ammonioborite group (4 Δ + 1 Tetrahedron )
Ammonioborite (NH4)3B15O20(OH)8 4 H2O mon., C2/c G

6.EA.20. - (group reserved) (3 Δ + 2 Tetrahedra)

6.EA.25. Ulexite group (2 Δ + 3 Tetrahedra)
Ulexite NaCaB5O6(OH)6 5 H2O tric., P-1 FOTOG

6.EB. Ino-pentaborates
6.EB.05. Larderellite group (4 Δ + 1 Tetrahedron)
Larderellite NH4B5O7(OH)2 H2O mon., P21/c FOTOG

6.EB.10. Ezcurrite group (3 Δ + 2 Tetrahedra)
Ezcurrite Na2B5O7(OH)3 2 H2O tric., P-1 G

6.EB.15. Probertite group (2 Δ + 3 Tetrahedra)
Probertite NaCaB5O7(OH)4 3 H2O mon., P21/a FOTOG

6.EB.20. Tertschite group
Tertschite Ca2B5O7(OH)5 7 H2O (?) mon. (?) Q

6.EB.25. Priceite group
Priceite Ca2B5O7(OH)5 H2O tric. G

6.EC. Phyllo-pentaborates
6.EC.05. Biringuccite group (3 Δ + 2 Tetrahedra)
Biringuccite Na2B5O8(OH) H2O mon., P21/c A
Nasinite Na2B5O8(OH) 2 H2O orth., Pna21 A

6.EC.10. Gowerite group (3 Δ + 2 Tetrahedra + 1 Δ)
Gowerite Ca(B5O8(OH))(B(OH)3) 3 H2O mon., P21/a A

6.EC.15. Veatchite group (3 Δ + 2 Tetrahedra + 1 Δ)
Veatchite Sr2(B5O8(OH))2(B(OH)3) H2O mon., Aa G
Veatchite-A Sr2(B5O8(OH))2(B(OH)3) H2O tric., A-1 or A1 IMA 1978-030
Veatchite-P Sr2(B5O8(OH))2(B(OH)3) H2O mon., P21 A

6.EC.20. Volkovskite group (3 Δ + 2 Tetrahedra + 1 Δ)
Volkovskite Ca4(B5O8(OH))4(B(OH)3)2 KCl 4 H2O tric., P1 A

6.EC.25. Tuzlaite group (2 Δ + 3 Tetrahedra + 1 Δ)
Tuzlaite CaNa(B5O8(OH)2) 3 H2O mon., P21/c IMA 1993-022

6.EC.30. Heidornite group
Heidornite Ca3Na2(B5O8(OH)4)(SO4)2Cl mon., C2/c FOTOG

6.EC.35. Brianroulstonite group
Brianroulstonite Ca3B5O6(OH)6)Cl2(OH) 8 H2O mon., Pa IMA 1996-009

6.ED. Tekto-pentaborates
6.ED.05. Hilgardite group (2 Δ + 3 Tetrahedra)
Hilgardite (Hilgardite-1A) Ca2B5O9Cl H2O tric., P1 G
    Hilgardite-3A Ca2B5O9Cl H2O tric., P1 Poly
    Hilgardite-4M Ca2B5O9Cl H2O mon., Aa Poly
Kurgantaite CaSrB5O9Cl H2O tric., P1 Rd
Tyretskite Ca2B5O9(OH) H2O tric., P1 A
Leucostaurite Pb2B5O9Cl 0.5 H2O orth., Pnn2 IMA 2007-047

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)