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锡锰钽矿(wodginite)理想式为MnSnTa2O8,Z=4,其结构为锡铁钽矿(ixiolite)结构的有序化形式。它是钽的主要工业矿物,是高度分异演化伟晶岩的标志矿物之一。在加拿大红十字湖地区锂云母-透锂长石伟晶岩脉中发现了这一钽矿物。矿物为黑褐色,呈半自形,颗粒达0.2mm,分布于由锂云母钠长石构成的条带中,与之共生的是一套典型的、高演化的花岗伟晶岩矿物组合。锡锰钽矿具有Mn/Fe、Sn/Ti、Ta/Nb比值高,杂质少的特点。矿物平均分子式为:Mn1.00(Sn0.64Ta0.24Ti0.04Mn0.04Zn0.02Fe0.01)0.99(Ta1.69Nb0.31)2.00O8;晶胞参数a=0.9534nm,b=1.1482nm,c=0.5123nm,β=91°07’,V=0.5607nm3。依据矿物β>91°、V>0.560nm3、对偶面网221与221具强分裂衍射双峰、I021/I220为0.19和Mn/(Fe+Mn)≈1等特征,在锡锰钽矿与锡铁钽矿所构成的同质多像、有序-部分有序-无序这样一个连续系列中,本区所产锡锰钽矿属有序端员矿物,其阳离子在八面体中分布的有序度约为95%。在钽资源的寻找和开发利用中,应重视含锡锰钽矿的锂云母-透锂长石伟晶岩脉。
The wodginite is ideally MnSnTa2O8, Z = 4, and its structure is an ordered form of the ixiolite structure. It is the major industrial mineral of tantalum and one of the hallmarks of highly differentiated evolution pegmatites. This tantalum mineral was found in the lepidocrocite-lithiated feldspathic pegmatites in the Red Cross Lake, Canada. Minerals are dark brown, semi-self-forming, with a particle size of 0.2 mm, distributed in a band of lepidocral sodium alginate, with which a typical and highly evolved granitic pegmatite assemblage is found. Tin manganese tantalum ore with Mn / Fe, Sn / Ti, Ta / Nb ratio of high impurities less characteristics. The average molecular formula of the minerals is: Mn1.00 (Sn0.64Ta0.24Ti0.04Mn0.04Zn0.02Fe0.01) 0.99 (Ta1.69Nb0.31) 2.00O8; unit cell parameters a = 0.9534nm, b = 1.1482nm, c = 0.5123 nm, β = 91 ° 07 ’, V = 0.5607 nm3. According to the mineral β> 91 °, V> 0.560nm3, there are strong double peaks of splitting diffraction for 221 and 221 of LC2 network, the characteristics of I021 / I220 are 0.19 and Mn / (Fe + Mn) ≈1. Tantalum ore formed by the homogeneous more like, order - part of the order - disorder such a continuous series, the region produced tin manganese tantalum ore is an ordered terminal member of the mineral, the cation distribution in the octahedron are The order is about 95%. In the search for tantalum resources and the development and utilization, we should attach importance to the lithium-mica-tremorite pegmatite veins containing tin-manganese tantalum ore.