【摘要】 镁斜磷铁锰矿产于四川某地含铍伟晶岩的中部，该伟晶岩分带性弱，但钠长石化发育，与之共生的矿物有镁电气石、蓝色绿柱石、石榴石、白云母、石英及黄铁矿等。镁斜磷铁锰矿为肉红色块状体，玻璃光泽，摩氏硬度５．５－６．０，比重３．８１，具（００１）解理，在单偏光下无色或带有灰色的白色，多色性弱，突起较高，Ｎｇ＝１．７３４，Ｎｍ＝１．７２８，Ｎ＿Ｐ＝１．６７５，Ｎｇ－Ｎ＿Ｐ＝０．０５９，斜消光，Ｒ＞Υ。镁斜磷铁锰矿的化学成分Ｗ（Ｂ）／％是Ｍｇｏ６．２ｌ．Ｃａｏ０．０７，Ａｌ＿２Ｏ＿３０．８ｉ，Ｓｉｏ＿２ｏ．３９，ＭｎＯｌ４．３６．Ｆｅｏ＿３５．４８，Ｐ＿２ｏ＿５４ｌ．８５，∑９９．１７。更多还原

【Abstract】 A yellowish pink mineral was gathered from a pegmatite mine in Sichuan of China,and the studies show that it is a new variety of sarcopside group.It is massive in shape and associ-ated with beryl,garent,muscovite etc. In hand specimens Mg-sarcopside is yallowish pink,and browish pink,in colour with glassy luster.It has Mohs’5.5-6.0.Its pecity gravity is 3.18 g/cm3.The mineral is biaxial Ng=1. 734 ,Nm=1.728,Np=1.675,R>γ.The chemical compo-sitions of Mg-sarcopside W_B%are : MgO 6.21,Al2O3 0.81,SiO2 0.39,CaO 0.07,MnO 14.36,FeO 35.48,P2O5 41.85,Tota1 99.17.The crystallochemical formula of the mineral is（Fe、Mn Mg1.42）6.4（P₄.059 Al₀.108 Si₀.04）₄.207,O₁6.63,z=2.The strongest X-ray lines are:0.605 9 nm（100,001）,0. 393 6 nm（42,201）,0.353 5 nm（38,210）,0.302 9 nm（82, 002）,0.281 2 nm（34.310）,0.255 7 nm（29,311）,0.1514 nm（30,602）.Cell constants are:a=1.048 nm,b=0.177 6 nm,c=0. 505 8 nm,V=0.302 465nm3,Z=2,β=90°The curves of IR absorption spectra of Mg-sarcopside is also given in this paper.更多还原