| Summary: | Single crystals of a new transition metal adelite-descloizite-type structure were synthesized using a high temperature (580 °C) high-pressure hydrothermal technique. Single crystal X-ray diffraction and energy dispersive X-ray analysis (EDX) were used to investigate the structure and elemental composition, respectively. SrNi(VO<sub>4</sub>)(OH) crystallizes in an acentric orthorhombic crystal system in the space group <i>P</i>2<sub>1</sub>2<sub>1</sub>2<sub>1</sub> (no. 19); <i>Z</i> = 4, <i>a</i> = 5.9952(4) Å, <i>b</i> = 7.5844(4) Å, <i>c</i> = 9.2240(5) Å. The structure is comprised of a Ni–O–V framework where Sr<sup>2+</sup> ions reside inside the channels. Single-crystal magnetic measurements display a significant anisotropy in both temperature- and field-dependent data. The temperature dependent magnetic measurement shows antiferromagnetic behavior at <i>T</i><sub>N</sub>~8 K. Overall, the magnetic properties indicate the presence of competing antiferromagnetic and ferromagnetic interactions of SrNi(VO<sub>4</sub>)(OH).
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