Abstract Cadvanite (IMA2025-005), CdV2O6, is a new mineral discovered at the Burro mine, Slick Rock district, San Miguel County, Colorado, USA. It was found in a secondary efflorescent assemblage on matrix composed of quartz grains, covellite–klockmannite, and cadmoselite and it is associated with brochantite, chalcomenite, clinochalcomenite, gypsum, and volborthite. The mineral occurs as poorly formed brownish-yellow blades. The streak is pale yellow, the luster is dull, silky, or adamantine, the Mohs hardness is about 2½–3, the tenacity is brittle, the fracture is splintery, and there are probably two cleavages, possibly 100 and 001. The calculated density is 4. 210 g/cm3. Electron probe microanalysis provided the empirical formula Cd1. 00V2. 00O6. Cadvanite is monoclinic, space group C2/m, a = 9. 831 (10), b = 3. 6220 (9), c = 7. 051 (5) Å, β = 103. 97 (2) °, V = 243. 65 (7) Å3, and Z = 2. In the crystal structure (R1 = 0. 0505 for 1210 I 2σI reflections), Cd2+O6 octahedra form a straight edge-sharing chain and the V5+O5 polyhedra form a zig-zag edge-sharing VO3− chain. The two chains link to one another by corner sharing to form a three-dimensional framework.
Kampf et al. (Sun,) studied this question.