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Joëlbruggerite, ideally Pb 3 Zn 3 (Sb 5+ ,Te 6+ )As 2 O 13 (OH,O), is a new arsenate mineral (IMA 2008-034) and the Sb 5+  analog of dugganite, from the Black Pine mine, 14.5 km northwest of Philipsburg, Granite County, Montana. It is usually found perched on mimetite; other species that may be present include malachite, azurite, pseudomalachite, chalcocite, beudantite-corkite, duftite, dugganite, and kuksite, in milky quartz veins. Joëlbruggerite occurs as barrel-shaped or prismatic crystals up to about 50 μm across in various shades of purple. The crystals have an adamantine luster and a white streak. Mohs hardness is about 3. The fracture is irregular, and the tenacity is brittle. Joëlbruggerite crystals are uniaxial (-), with a calculated refractive index of n = 1.993, and weakly pleochroic: X = Y = gray, Z = purple; absorption: Z &gt; X = Y. Crystals show straight extinction and are length-fast. The empirical chemical formula (mean of 5 electron microprobe analyses) calculated on the basis of 14 [O + OH] anions is Pb 3.112 (Zn 2.689 Fe 2+  0.185 ) Σ2.874 (Sb 5+  0.650 Te 6+  0.451 ) Σ1.101 (As 1.551 P 0.203 Si 0.160 ) Σ1.914 O 13.335 (OH) 0.665 . Joëlbruggerite is trigonal, space group P321, a = 8.4803(17), c = 5.2334(12) Å, V = 325.94(12) Å 3 , Z = 1. The five strongest lines in the powder X-ray diffraction pattern are [dobs in Å (I) (hkl)]: 3.298 (100) (111), 3.008 (89) (021), 1.905 (39) (122, 131), 2.456 (36) (012, 121, 030), and 1.609 (30) (112, 132, 231, 140). The crystal structure was solved from single-crystal X-ray diffraction data and refined to R 1  = 0.038 on the basis of 604 unique reflections with F &gt; 4σ(F). It is composed of heteropolyhedral sheets of edge-sharing (Sb,Te)O 6  octahedra and PbO 8  disphenoids, oriented parallel to (001). The sheets are cross-linked by AsO 4  and ZnO 4  tetrahedra, which share corners to form an interlinked, two- and threeconnected two-dimensional net parallel to (001). The mineral is named for Joël Brugger (born 1967), Swiss-Australian mineralogist, for his contributions to mineralogy.

Joëlbruggerite, Pb 3 Zn 3 (Sb 5+ ,Te 6+ )As 2 O 13 (OH,O), the Sb 5+ analog of dugganite, from the Black Pine mine, Montana