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

(Sulfates, Selenates, Tellurates, Chromates, Molybdates, Wolframates)

7.A: Sulfates etc. without additional anions, without water

7.AA. With small cations
7.AA.05. Group reserved

7.AB. With medium-sized cations
7.AB.05. Millosevichite group
Millosevichite Al2(SO4)3 trig., R-3 FOTO G
Mikasaite Fe2(SO4)3 trig., R-3 IMA 1992-015

7.AB.10. Chalcocyanite group
Chalcocyanite Cu(SO4) orth., Pnma FOTO G
Zinkosite Zn(SO4) orth., Pnma G
Ferrotellurite Fe-Tellurate (?) (?) Q

Zinkosite is probably an artificial product, the natural occurrence is doubtful.

7.AC. With medium-sized and large cations
7.AC.05. Vanthoffite group
Vanthoffite Na6Mg(SO4)4 mon., P21/c FOTO ENTDECKUNGG

7.AC.10. Langbeinite group
Langbeinite K2Mg2(SO4)3 cub., P213 FOTO ENTDECKUNGG
Manganolangbeinite K2Mn2(SO4)3 cub., P213 G
Efremovite (NH4)2Mg2(SO4)3 cub., P213 FOTOIMA 1987-033

7.AC.15. Yavapaiite group
Eldfellite NaFe(SO4)2 mon., B2/m IMA 2007-051
Yavapaiite KFe(SO4)2 mon., C2/m G

7.AC.20. Godovikovite group
Steklite KAl(SO4)2 trig., P321 IMA 2011-041
Godovikovite (NH4)Al(SO4)2 trig., P321 FOTOIMA 1987-019
Sabieite (NH4)Fe(SO4)2 trig., P321 IMA 1982-088

7.AC.25. Thenardite group
Thenardite Na2(SO4) orth., Fddd FOTO G

7.AC.30. Metathenardite group
Metathenardite Na2(SO4) trig., P-3m1 (?) H

An incompletely characterized high-temperature polymorph of thenardite from volcanic occurrences. Breaks down to polymorphs of thenardite upon cooling and standing.

7.AC.35. Aphthitalite group
Aphthitalite K3Na(SO4)2 trig., P-3m1 G

7.AC.40. Pyracmonite group
Pyracmonite (NH4)3Fe(SO4)3 trig., R3c FOTO IMA 2008-029

7.AD. With only large cations
7.AD.05. Arcanite group
Arcanite K2(SO4) orth., Pmcn G
Mascagnite (NH4)2(SO4) orth., Pmcn FOTO G

7.AD.10. Mercallite group
Mercallite K(HSO4) orth., Pbca G

7.AD.15. Misenite group
Misenite K8(HSO4)6(SO4) mon. G

7.AD.45. Letovicite group
Letovicite (NH4)3(HSO4)(SO4) tric., P-1 FOTO G

7.AD.25. Glauberite group
Glauberite CaNa2(SO4)2 mon., C2/c G

7.AD.30. Anhydrite group
Anhydrite Ca(SO4) orth., Amma FOTO G

7.AD.35. Baryte group
Celestite  /  Coelestin Sr(SO4) orth., Pnma FOTOA
Baryte Ba(SO4) orth., Pnma FOTOA
Anglesite Pb(SO4) orth., Pnma FOTOG
Olsacherite Pb2(SO4)(SeO4) orth., P2212 IMA 1969-009

7.AD.40. Palmierite group
Kalistrontite K2Sr(SO4)2 trig., R-3m A
Palmierite K2Pb(SO4)2 trig., R-3m G

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 (2007-2012)