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Ophirite, Ca 2 Mg 4 [Zn 2 Mn 2   3+ (H 2 O) 2 (Fe 3+ W 9 O 34 ) 2 ]·46H 2 O, is a new mineral species from the Ophir Hill Consolidated mine, Ophir district, Oquirrh Mountains, Tooele County, Utah, U.S.A. Crystals of ophirite are orange-brown tablets on {001} with irregular {100} and {110} bounding forms; individual crystals are up to about 1 mm in maximum dimension and possess a pale orange streak. The mineral is transparent, with a vitreous luster; it does not fluoresce in short- or long-wave ultraviolet radiation. Ophirite has a Mohs hardness of approximately 2 and brittle tenacity. No cleavage or parting was observed in the mineral. The fracture is irregular. The density calculated from the empirical formula using the single-crystal cell data is 4.060 g/cm 3 . Ophirite is biaxial (+) with a 2V angle of 43(2)°. Indices of refraction for ophirite are α = 1.730(3), β = 1.735(3), γ = 1.770(3)°. The optic orientation (incompletely determined) is Y ∠  b  ≈ 9° and one optic axis is approximately perpendicular to {001}. Dispersion r &gt; v, strong; pleochroism is X = light orange brown, Y = light orange brown, Z = orange brown; X &lt; Y &lt;&lt; Z. Chemical analyses of ophirite were obtained by electron probe microanalysis; optimization of that analysis using the results of the crystal-structure analysis yielded the formula

Ophirite, Ca 2 Mg 4 [Zn 2 Mn 2 3+ (H 2 O) 2 (Fe 3+ W 9 O 34 ) 2 ]·46H 2 O, a new mineral with a heteropolytungstate tri-lacunary Keggin anion