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Lakebogaite, ideally CaNaFe 2  3+ H(UO 2 ) 2 (PO 4 ) 4 (OH) 2 (H 2 O) 8 , is a new Ca-Na-Fe uranyl phosphate mineral from a quarry in Upper Devonian granite near Lake Boga, northern Victoria, Australia. It is associated with Na-analogue of meurigite (IMA 2007-024), torbernite, and saléeite on a matrix of microcline, albite, smoky quartz, and muscovite. Lakebogaite occurs as bright lemon-yellow transparent prismatic crystals up to 0.4 mm across. The crystals have a vitreous luster and a pale yellow streak. Mohs hardness is about 3. The fracture is even to conchoidal. In transmitted light, the mineral is pale yellow with very weak pleochroism: X = yellow, Y = grayish yellow, Z = grayish yellow: dispersion r &gt; v, strong. Lakebogaite crystals are biaxial (+), with slightly variable refractive indices within the ranges: n α  = 1.650(2)-1.652(2), n β  = 1.660(4)-1.664(3), n γ  = 1.681(3)-1.686(2), measured using white light, and with 2V meas  = 80-85° and 2V calc  = 70-74°. Orientation: Y = b; crystals are elongated along [010], resulting in straight extinction. The empirical chemical formula (mean of nine electron microprobe analyses) calculated on the basis of 30 anions is (Ca 1.00 Na 0.80 Sr 0.10 ) Σ1.90 (Fe 3+  1.85 Al 0.30 ) Σ2.15 (UO 2 ) 1.80  (PO 4 ) 4.07 (OH,H 2 O) 10.12 . Lakebogaite is monoclinic, space group Cc, a = 19.6441(5), b = 7.0958(2), c = 18.7029(5) Å, β = 115.692(1)°, V = 2349.3(7) Å 3 , Z = 4. The seven strongest reflections in the powder X-ray diffraction pattern are [dobs in Å (I) (hkl)]: 6.60 (100) (110), 3.16 (40) (514̅, 604̅), 4.07 (20) (404̅), 3.80 (20) (314̅), 3.56 (20) (020, 312), 3.31 (20) (114, 220), 2.797 (20) (006). The crystal structure was solved from single-crystal X-ray diffraction data and refined to R 1  = 0.038 on the basis of 5222 unique reflections with F &gt; 4σF. It comprises pairs of edge-shared UO 7  pentagonal bipyramids that are inter-linked via corner-sharing with PO 4  tetrahedra, to form chains parallel to the c-axis. Each UO 7  polyhedron also shares one of its edges with another PO 4  tetrahedron. The (UO 2 ) 2 (PO 4 ) 4  chains are cross-linked via corner-sharing between the PO 4  tetrahedra and Fe 3+ O 4 (OH) 2  octahedra. The octahedra join together by corner-sharing via OH anions to form chains parallel to b. The Na +  and Ca 2+  cations, and 4 water molecules occupy eight-sided channels along [010]. The remaining water molecules occupy large ten-sided channels directed along [001] and intersecting the [010] channels. The mineral is named for the nearest township.

Lakebogaite, CaNaFe 2 3+ H(UO 2 ) 2 (PO 4 ) 4 (OH) 2 (H 2 O) 8 , a new uranyl phosphate with a unique crystal structure from Victoria, Australia