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Celleriite,□      (Mn   2   2  +    Al   )Al   6    (Si   6    O   18)(BO   3    )    3(  OH  )   3   (  OH  )  ,$\square \,\left( \text{Mn}_{2}^{2+}\text{Al} \right)\text{A}{{\text{l}}_{6}}\left( \text{S}{{\text{i}}_{6}}{{\text{O}}_{18}} \right){{\left( \text{B}{{\text{O}}_{3}} \right)}_{3}}{{(\text{OH})}_{3}}(\text{OH}),$   is a new mineral of the tourmaline supergroup. It was discovered in the Rosina pegmatite, San Piero in Campo, Elba Island, Italy (holotype specimen), and in the Pikárec pegmatite, western Moravia, Czech Republic (co-type specimen). Celleriite in hand specimen is violet to gray-blue (holotype) and dark brownish-green (co-type) with a vitreous luster, conchoidal fracture, and white streak. Celleriite has a Mohs hardness of ~7 and a calculated density of 3.13 and 3.14 g/cm 3  for holotype and its co-type, respectively. In plane-polarized light in thin section, celleriite is pleochroic (O = pale violet and E = light gray-blue in holotype; O = pale green and E = colorless in co-type) and uniaxial negative. Celleriite has trigonal symmetry: space group  R 3 m ,  Z  = 3,  a  = 15.9518(4) and 15.9332(3) Å,  c  = 7.1579(2) and 7.13086(15) Å,  V  = 1577.38(9) and 1567.76(6) Å 3  for holotype and co-type, respectively (data from single-crystal X‑ray diffraction). The crystal structure of the holotype specimen was refined to  R 1 = 2.89% using 1696 unique reflections collected with Mo K α X‑ray intensity data. Structural, chemical, and spectroscopic analyses resulted in the formulas:                x(    □   0.58Na    0.42)    ∑  1.00    Y    (Mn    1.39    2  +Fe    0.16    2  +Mg    0.01Al    1.14Fe    0.01    3.0Li    0.28        T   0.01)    Σ  3.00Z    Al  6    [   T(Si    5.99Al    0.01)Σ  6.00O   18](BO   3    )   3    (  OH  )  3w[(  OH  )    0.65        F   0.03O   0.32]    Σ  1.00       (for     holotype)$\begin{align}&amp; \,\,\,\,{{\,}^{\text{x}}}{{\left( {{\square }_{0.58}}\text{N}{{\text{a}}_{0.42}} \right)}_{\sum 1.00}}\text{Y}{{\left( \text{Mn}_{1.39}^{2+}\text{Fe}_{0.16}^{2+}\text{M}{{\text{g}}_{0.01}}\text{A}{{\text{l}}_{1.14}}\text{Fe}_{0.01}^{3.0}\text{L}{{\text{i}}_{0.28}}~{{\text{T}}_{0.01}} \right)}_{\Sigma 3.00}}^{\text{Z}}\text{A}{{\text{l}}_{6}}\left[ {{~}^{\text{T}}}{{\left( \text{S}{{\text{i}}_{5.99}}\text{A}{{\text{l}}_{0.01}} \right)}_{\Sigma 6.00}}{{\text{O}}_{18}} \right]{{\left( \text{B}{{\text{O}}_{3}} \right)}_{3}}{{(\text{OH})}_{3}} \\ &amp; ^{\text{w}}{{\left[ {{(\text{OH})}_{0.65}}~{{\text{F}}_{0.03}}{{\text{O}}_{0.32}} \right]}_{\Sigma 1.00}}\,\text{(for}\,\text{holotype)} \\ \end{align}$   and                   X(    □   0.51Na    0.49)    Σ  1.00Y(Mn    0.90    2  +Fe    050    2  +Al    1.36Fe    004    3  +Li    0.17Zn    0.04)    Σ  3.00Z    Al  6    [T(Si    5.75        B   0.25)Σ  6.00O   18](BO   3    )   3    (  OH  )  3w[(  OH  )    0.35        F   0.17O   0.48]    ∑  1.00    (for     co-type)$\begin{align}&amp; \,\,\,\,\,{{\,}^{\text{X}}}{{\left( {{\square }_{0.51}}\text{N}{{\text{a}}_{0.49}} \right)}_{\Sigma 1.00}}^{\text{Y}}{{\left( \text{Mn}_{0.90}^{2+}\text{Fe}_{050}^{2+}\text{A}{{\text{l}}_{1.36}}\text{Fe}_{004}^{3+}\text{L}{{\text{i}}_{0.17}}\text{Z}{{\text{n}}_{0.04}} \right)}_{\Sigma 3.00}}^{\text{Z}}\text{A}{{\text{l}}_{6}}\left[ ^{\text{T}}{{\left( \text{S}{{\text{i}}_{5.75}}~{{\text{B}}_{0.25}} \right)}_{\Sigma 6.00}}{{\text{O}}_{18}} \right]{{\left( \text{B}{{\text{O}}_{3}} \right)}_{3}}{{(\text{OH})}_{3}} \\ &amp; ^{\text{w}}{{\left[ {{(\text{OH})}_{0.35}}~{{\text{F}}_{0.17}}{{\text{O}}_{0.48}} \right]}_{\sum 1.00}}\text{(for}\,\text{co-type)} \\ \end{align}$

american mineralogist

Celleriite,         □   (    M     n    2     2  +      A  l    )    A     l    6     (    S     i    6      O     1  8      )      (    B     O    3     )     3       (  O  H  )     3     (  O  H  )  ,      $\square \left( \mathbf{Mn}_{\mathbf{2}}^{\mathbf{2+}}\mathbf{Al} \right)\mathbf{A}{{\mathbf{l}}_{\mathbf{6}}}\left( \mathbf{S}{{\mathbf{i}}_{\mathbf{6}}}{{\mathbf{O}}_{\mathbf{18}}} \right){{\left( \mathbf{B}{{\mathbf{O}}_{\mathbf{3}}} \right)}_{\mathbf{3}}}{{\mathbf{(OH)}}_{\mathbf{3}}}\mathbf{(OH),}$   , a new mineral species of the tourmaline supergroup