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Jasonsmithite (IMA2019-121),M   n42   +\begin{equation} \mathrm{Mn}_{4}^{2+} \end{equation}   ZnAl(PO 4 ) 4 (OH)(H 2 O) 7 ·3.5H 2 O, is a pegmatite-phosphate mineral from the Foote Lithium Company mine, Kings Mountain district, Cleveland County, North Carolina, U.S.A. It is interpreted as having formed by late-stage, low-temperature hydrothermal alteration. Crystals are colorless to light brown, slightly flattened prisms to about 1 mm in length with wedge-shaped terminations. The mineral is transparent with vitreous luster, white streak, Mohs hardness 2, brittle tenacity, irregular fracture, and perfect {001} cleavage. The density is 2.63(2) g/cm 3 . Jasonsmithite is biaxial (–), with α = 1.561(2), β = 1.580(2), γ = 1.581(2), measured in white light. The 2 V  is 25(5)° and dispersion is  r  &lt;  v  moderate. The optical orientation is  Y  =  b ,  X  ^  c  = 18° in obtuse β. The Raman spectrum is dominated by vibrational modes of PO 4  and ZnO 4  tetrahedra, AlO 6  and MnO 6  octahedra, and OH groups. Electron microprobe analyses gave the empirical formula (Mn 3.09 Fe 0.87 ) Σ3.96 Zn 1.05 Al 0.98 (PO 4 ) 4 (OH)(H 2 O) 7 ·3.5H 2 O. The mineral is monoclinic,  P 21/ c ,  a  = 8.5822(3),  b  = 13.1770(6),  c  = 20.3040(14) Å, β = 98.485(7)°,  V  = 2271.0(2) Å 3 , and  Z  = 4. The structure ( R  1  = 0.0443 for 3685  I &gt;2σ I  reflections) contains zigzag chains of edge-sharing MnO 6  octahedra that corner-link to adjacent chains and to PO 4  tetrahedra to form sheets, which are decorated by ZnO 4  tetrahedra. The sheets are linked to one another via dimers of AlO 6  octahedra, forming a framework with large channels containing H 2 O groups. With H 2 O groups removed, the framework has a void space of 70.2% per unit cell, and a framework density of 14.5 polyhedral atoms/1000 Å 3 , which would place jasonsmithite among the most porous minerals.

Jasonsmithite, a new phosphate mineral with a complex microporous framework, from the Foote mine, North Carolina, U.S.A