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The new minerals carlsonite (IMA2014-067),(  NH4)5F  e    3   3  +O  (  SO4)6⋅    7H2O${{\rm{(N}}{{\rm{H}}_{\rm{4}}}{\rm{)}}_{\rm{5}}}{\rm{Fe}}_3^{3 + }{\rm{O(S}}{{\rm{O}}_{\rm{4}}}{{\rm{)}}_{\rm{6}}} \cdot {\rm{7}}{{\rm{H}}_{\rm{2}}}{\rm{O}}$    , and huizingite-(Al) (IMA2015-014), (NH 4 ) 9 Al 3 (SO 4 ) 8 (OH) 2 ·4H 2 O, formed from a natural fire in an oil-bearing shale near Milan, Ohio. Carlsonite crystals are yellow to orange-brown thick tablets, flattened on {001}, or stout prisms, elongated on [110], up to about 0.5 mm in size. The mineral has a tan streak, vitreous luster, Mohs hardness of 2, brittle tenacity, irregular fracture, perfect {001} cleavage, calculated density of 2.167 g/cm 3 , and is easily soluble in H 2 O. Carlsonite is optically biaxial (–), a = 1.576(1), b = 1.585(1), and g = 1.591(1) (white light). Huizingite-(Al) crystals, typically intergrown in light greenish yellow drusy aggregates, are tabular to bladed, flattened on {100}, up to about 0.25 mm in maximum dimension. The mineral has a white streak, vitreous luster, Mohs hardness of 2, brittle tenacity, irregular fracture, no cleavage, calculated density of 2.026 g/cm 3 , and is easily soluble in H 2 O. Huizingite-(Al) is optically biaxial (+) with  a  = 1.543(1), b = 1.545(1), and g = 1.563(1) (589.6 nm light). Raman and infrared spectroscopy was conducted on both minerals. Electron microprobe analyses provided the empirical formulas[  (  NH4)4.64Na0.24K0.12]∑  5.00F  e3.    053  +O  (  SO4)6⋅  6.93H    2O${{\rm{[(N}}{{\rm{H}}_{\rm{4}}}{{\rm{)}}_{{\rm{4}}{\rm{.64}}}}{\rm{N}}{{\rm{a}}_{{\rm{0}}{\rm{.24}}}}{{\rm{K}}_{{\rm{0}}{\rm{.12}}}}{\rm{]}}_{\sum 5.00}}{\rm{Fe}}_{3.{\rm{05}}}^{3 + }{\rm{O(S}}{{\rm{O}}_{\rm{4}}}{{\rm{)}}_{\rm{6}}} \cdot 6.93{{\rm{H}}_2}{\rm{O}}$    and[  (  NH4)8.76Na0.22K0.02]∑    9.00(  Al1.65F  e1.343  +)∑    2.99(  O  H)1.98(H2O  )4.02(  SO4)8.00${{\rm{[(N}}{{\rm{H}}_{\rm{4}}}{{\rm{)}}_{{\rm{8}}{\rm{.76}}}}{\rm{N}}{{\rm{a}}_{{\rm{0}}{\rm{.22}}}}{{\rm{K}}_{{\rm{0}}{\rm{.02}}}}{\rm{]}}_{\sum {\rm{9}}{\rm{.00}}}}{{\rm{(A}}{{\rm{l}}_{{\rm{1}}{\rm{.65}}}}{\rm{Fe}}_{{\rm{1}}{\rm{.34}}}^{{\rm{3 + }}}{\rm{)}}_{\sum {\rm{2}}{\rm{.99}}}}{\rm{ (OH}}{{\rm{)}}_{{\rm{1}}{\rm{.98}}}}{{\rm{(}}{{\rm{H}}_{\rm{2}}}{\rm{O)}}_{{\rm{4}}{\rm{.02}}}}{{\rm{(S}}{{\rm{O}}_{\rm{4}}}{\rm{)}}_{{\rm{8}}{\rm{.00}}}}$    for carlsonite and huizingite-(Al), respectively. Huizingite compositions with Fe &gt; Al were noted. Carlsonite is triclinic,  P1, a  = 9.5927(2),  b  = 9.7679(3),  c  = 18.3995(13) Å, α = 93.250(7)°, β = 95.258(7)°, γ = 117.993(8)°,  V  = 1506.15(16) Å 3 , and  Z  = 2. Huizingite-(Al) is triclinic,  P1  ¯$\bar 1$   ,  a  = 9.7093(3)  b  = 10.4341(3), c = 10.7027(8) Å, α = 77.231(5)°, β = 74.860(5)°, γ = 66.104(5)°,  V  = 948.73(9) Å 3 , and  Z  = 1. The five strongest lines in the X-ray powder diffraction pattern of carlsonite are [ d  obs  in Å( I )( hkl )]. 9.23(100)(002); 8.26(40)(100,011); 7.57(43)(1  ¯$\bar 1$   11,11  ¯$\bar 1$   1,011); 4.93(23)(1  ¯$\bar 1$1  ¯$\bar 1$   ,1  ¯$\bar 1$   20); and 3.144(41)(multiple). Those for huizingite-(Al) are: 8.82(60)(100); 5.04(69)(121); 3.427(100)(2  ¯$\bar 2$2  ¯$\bar 2$   1); 3.204(68)(2  ¯$\bar 2$   11); and 3.043(94)(21  ¯$\bar 1$   2,312).

american mineralogist

Carlsonite,          (  N        H      4         )      5         F  e    3   3  +      O  (  S        O      4          )      6      ⋅    7        H      2        O     ${{\rm{(N}}{{\rm{H}}_{\rm{4}}}{\rm{)}}_{\rm{5}}}{\rm{Fe}}_3^{3 + }{\rm{O(S}}{{\rm{O}}_{\rm{4}}}{{\rm{)}}_{\rm{6}}} \cdot {\rm{7}}{{\rm{H}}_{\rm{2}}}{\rm{O}}$    , and huizingite-(Al), (NH 4 ) 9 Al 3 (SO 4 ) 8 (OH) 2 ·4H 2 O, two new minerals from a natural fire in an oil-bearing shale near Milan, Ohio