【摘要】 <正> 1980年秋,作者在内蒙白云鄂博铁-稀土矿床西矿铁矿体下盘含稀土的白云岩中,发现一种淡灰黄色的锶稀土磷酸盐碳酸盐矿物。进一步研究确认它是一个新矿物,并根据其产地附近的山脉命名为大青山矿(Daqingshanite)。今年三月,经国际新矿物及矿物命名委员会(IMA)审议,获得全票通过。标本现存地质博物馆。更多还原

【Abstract】 Daqingshanite was found in a dolomite exposed somewhere in the mountain range of Daqingshan. The dolomite is a member of the Bayun Obo RE-Fe deposit near Baotou, Inner Monggolia. The grain size reaches 0.05mm across.The associated minerals are benstonite and phlogopite. The mineral forms minute network veinlets, locally forming monominerallic aggregates.Colour pale yellow, luster greasy, streak white. Cleavage（100）perfect.Density 3.81 （meas.）. Hardness （Vickers） 355kg/mm². Optically uniaxial, negative. Refractive indices,Ne=1.609,No=1.708.Colourless in thin sections.Non-fluorscent under ultraviolet light. Readily soluble in HCl with effervescence.Chemical analyses of the mineral are presented in Table 1. The empirical formula is given as, (Sr_1.53Ca_0.67Ba_0.63Mg_0.11Na_0.03)_2.97 (RE_0.76Al_0.02Fe_0.02³⁺)_0.08 [PO₄]_1.00 [CO₃]_2.33([OH]_0.46F_0.26O_0.07)_0.79, or ideally（Sr, Ca, Ba）₃ RE[PO₄] [CO₃]_3-x（OH,F）_y where Sr>Ca, Ba and OH>F, x≈y≈0.8X-ray s ingl crystal study shows it to be trigonal, R3m,a₀=10.058,c₀=9.225 （）Z=3. The strongest lines in the X-ray powder diffraction pattern are given in Table2.Absorption bands in infrared spectra are:1438, 1178, 1073, 1040, and 872 (cm^-1).The mineral is named after the mountain range of Daqingshan. Typical specimens are preserved at the National Geological Museum, Beijing.更多还原