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A new mineral species, zhanghuifenite, ideallyN   a3M   n42   +Mg2A   lP   O46,$\mathbf{N a}_{3} \mathbf{M n}_{4}^{2+} \mathbf{M} \mathbf{g}_{2} \mathbf{A l}\left(\mathbf{P O}_{4}\right)_{6},$   has been found in the Santa Ana mine, San Luis province, Argentina. It occurs in irregular veinlets or patches, 5 mm thick, in a nodule of beusite interlaminated with lithiophilite. Broken pieces of zhanghuifenite are blocky or tabular. Single crystals are up to 0.8 × 0.5 × 0.5 mm. No twinning or parting is observed macroscopically. The mineral is deep green, transparent with pale green streak and vitreous luster. It is brittle and has a Mohs hardness of ~5 with good cleavage on {010}. The measured and calculated densities are 3.63(2) and 3.62 g/cm 3 , respectively. Optically, zhanghuifenite is biaxial (+), with a = 1.675(2), β = 1.680(2), γ = 1.690(2) (white light), 2 V  (meas) = 74(2)°, and 2 V  (calc) = 71°. The calculated compatibility index based on the empirical formula is 0.020 (excellent). An electron microprobe analysis yields an empirical formula (based on 24 O apfu)N   a2.80C   a0.11Σ   2.91M   n3.092   +F   e0.472   +M   g0.36Σ   3.92M   g1.31F   e0.692   +Σ   2.00$\left(\mathrm{Na}_{2.80} \mathrm{Ca}_{0.11}\right)_{\Sigma 2.91}\left(\mathrm{Mn}_{3.09}^{2+} \mathrm{Fe}_{0.47}^{2+} \mathrm{Mg}_{0.36}\right)_{\Sigma 3.92}\left(\mathrm{Mg}_{1.31} \mathrm{Fe}_{0.69}^{2+}\right)_{\Sigma 2.00}$A   l0.81F   e0.193   +P   O46.$\left(\mathrm{Al}_{0.81} \mathrm{Fe}_{0.19}^{3+}\right)\left(\mathrm{PO}_{4}\right)_{6}.$   Zhanghuifenite is insoluble in water or hydrochloric acid.

american mineralogist

Zhanghuifenite,            N   a       3           M   n       4       2   +         M         g       2         A   l             P   O       4           6       ,     $\mathbf{N a}_{3} \mathbf{M n}_{4}^{2+} \mathbf{M} \mathbf{g}_{2} \mathbf{A l}\left(\mathbf{P O}_{4}\right)_{6},$    a new mineral isostructural with bobfergusonite, from the Santa Ana mine, San Luis province, Argentina