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在阿波罗12的12070,35号样品的显微角砾岩碎屑内发现了一粒与钛铁矿连生的并含有Nb_2O_5 6.4％,Cr_2O_3 3.2％及Ta_2O_5,V_2O_3,Ce_2O_3和La_2O_3各少于1％的金红石。其所含的成分在月球和地球的金红石中是独特的,因此它是月球岩石相月壤中迄今查明的第一个富铌矿物。 这个包在钛铁矿内部的透明非均质的黄褐色-黄色颗粒在显微角砾岩薄片中,被鉴定为铌金红石。它以单个晶体出现,直径约为60μ。其光性为一轴晶(+),多色性N_o=黄褐色-黄色,N_e=橄榄绿,两个折光率均高于2.10。 X射线衍射线谱表明为正方金红石晶格。单位晶
Within the breccia of micro-breccia samples of Apollo 12 samples No. 12070 and No. 35, a single collogen of ilmenite with 6.4% Nb 2 O 5, 3.2% Cr 2 O 3 and 5% less Ta 2 O 5, V 2 O 3, Ce 2 O 3 and La 2 O 3 1% rutile. Its composition is unique in the lunar and earth rutile, making it the first niobium-enriched mineral identified so far in the lunar rock phase. The transparent, inhomogeneous, yellowish brown-yellowed particle encased in the ilmenite was identified as niobium rutile in the microfracture flakes. It appears as a single crystal with a diameter of about 60μ. Its optical properties are uniaxial (+), multicolor N_o = tan - yellow, N_e = olive green, and both refractive indices are higher than 2.10. X-ray diffraction spectroscopy showed a regular rutile lattice. Unit of crystal