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Artroeite, PbAlF 3 (OH) 2 , space group P1̄, a = 6.270(2), b = 6.821(3), c = 5.057(2) Å, α = 90.68(2), β = 107.69(2), γ= 104.46(2)°, V = 198.6(2) Å 3 , Z = 2, is a new mineral from the Grand Reef mine, near Klondyke, Graham County, Arizona. It occurs as colorless bladed crystals associated with quartz, fluorite, galena, anglesite, and an as yet undescribed mineral of composition PbCa 2 Al(F,OH) 9 . Artroeite has a Mohs hardness of about 2.5, a measured density of 5.36(2) g/cm 3 , and a calculated density of 5.47 g/cm 3 . It exhibits a perfect {100} cleavage and a good {010} cleavage. Optically it is biaxial (-) with α = 1.629(1), β = 1.682(2), and γ = 1.691(2). Dispersion is strong, r &gt; ν. The six strongest powder diffraction lines are [d(I,hkl)]4.42 100 (1̄ 01), 3.221 40 (101), 2.595 70 (12̅1,021), 2.190 65 (201,012,030), 2.030 50 (022), 2.015 40 (2̅30) Å.

Artroeite, PbAIF 3 (OH) 2 , a new mineral from the Grand Reef mine, Graham County, Arizona: Description and crystal structure