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Strontiohurlbutite, ideally SrBe 2 (PO 4 ) 2 , is a new member of hurlbutite group discovered in the Nanping No. 31 pegmatite, Fujian province, southeastern China. Crystals are mainly found in zones I, II, and IV; they are platy, subhedral-to-anhedral, with a length from 5 mm to 1.5 mm. Associated minerals mainly include quartz, muscovite, beryl, hurlbutite, hydroxylherderite, apatite-group minerals, and phenakite. Strontiohurlbutite crystals are light blue, translucent-to-transparent, and have vitreous luster. The Mohs hardness is about 6, and the tenacity is brittle. Optically, strontiohurlbutite is biaxial (-), α = 1.563(3), β = 1.569(2), γ = 1.572(3) (white light), 2 V  meas  = 68.5(5)°, and exhibits weak dispersion, r &gt; v. The optical orientation is X =  b , Y ≈  c . Electron-microprobe and SIMS analyses (average of 16) give SrO 29.30, P 2 O 5  51.05, CaO 0.91, BaO 0.64, and BeO 17.71 wt%; total 99.61 wt%. The empirical formula, based on 8 O apfu, is (Sr 0.81 Ca 0.05 Ba 0.01 )S 0.87 Be 2.02 P 2.05 O 8 . The stronger eight lines of the measured X-ray powder-diffraction pattern [ d  in Å( I )( hkl )] are: 3.554(100)(121); 3.355(51)(211); 3.073(38)(022); 2.542(67)(113); 2.230(42)(213); 2.215(87)(321); 2.046(54)(223); 1.714(32)(143). Strontiohurlbutite is monoclinic, space group  P 2 1 / c ; unit-cell parameters refined from single-crystal X-ray diffraction data are:  α  = 7.997(3),  β  = 8.979(2),  γ  = 8.420(7) Å, b = 90.18(6)°,  V  = 604.7(1) Å 3  ( Z  = 4, calculated density = 3.101 g/cm 3 ). The mineral is isostructural with hurlbutite, CaBe2(PO4)2, and with paracelsian, BaAl 2 Si 2 O 8 . The formation of strontiohurlbutite is related to the hydrothermal alteration of primary beryl by late Sr- and P-rich fluids.

Strontiohurlbutite, SrBe 2 (PO 4 ) 2 , a new mineral from Nanping No. 31 pegmatite, Fujian Province, Southeastern China