Mattioli Michele, Cenni Marco
Department of Pure and Applied Sciences, University of Urbino Carlo Bo, Italy.
Data Brief. 2020 Jun 2;31:105791. doi: 10.1016/j.dib.2020.105791. eCollection 2020 Aug.
This dataset article contains mineralogical and chemical data of some natural zeolites such as analcime, natrolite, phillipsite and harmotome. These minerals were found as secondary phases within vesicles and veins in the basaltic rocks of the Lessini Mounts, Northern Italy. Methods for obtaining the datasets include optical microscopy, X-ray diffraction, scanning electron microscopy and electron probe microanalysis. Analcime forms well-developed, transparent to milky crystals with a typical icositetrahedron habit. The average composition of analcime is calculated as NaCaKBa[AlSiO] 16HO, with all of the extra-framework sites occupied by sodium. Natrolite usually forms hemispherical aggregates with glassy, colourless to white thin prismatic crystals, which generally radiate from a central point. The average chemical composition of natrolite is NaCaK[AlSiO] 16HO. Crystals of phillipsite-harmotome serie occur in a variety of forms and display a highly variable chemical composition, from almost pure compositions to intermediate values. Phillipsite is more common and its average chemical composition is CaNaKBa[AlSiO] 12HO, while harmotome is rare and has an average chemical composition of CaNaKBa[AlSiO] 12HO. The obtained dataset can be used for various purposes: it can be used by other authors to compare morphological features and chemical compositions of similar zeolites crystals discovered in other parts of the world, it can be compared with those obtained from similar geologic environments encouraging studies on hydrothermal processes, and it could represent the starting point for a potential exploration of zeolites from an industrial point of view.
本数据集文章包含一些天然沸石的矿物学和化学数据，如方沸石、钠沸石、钙十字沸石和片沸石。这些矿物在意大利北部莱希尼山玄武岩的气孔和脉体中作为次生相被发现。获取数据集的方法包括光学显微镜、X射线衍射、扫描电子显微镜和电子探针微分析。方沸石形成发育良好、透明至乳白的晶体，具有典型的二十四面体习性。方沸石的平均成分计算为NaCaKBa[AlSiO]₁₆H₂O，所有骨架外位点均被钠占据。钠沸石通常形成半球形聚集体，由玻璃状、无色至白色的薄棱柱体晶体组成，这些晶体通常从中心点放射状排列。钠沸石的平均化学成分是NaCaK[AlSiO]₁₆H₂O。钙十字沸石 - 片沸石系列的晶体有多种形态，化学成分变化很大，从几乎纯净的成分到中间值。钙十字沸石更常见，其平均化学成分是CaNaKBa[AlSiO]₁₂H₂O，而片沸石很少见，平均化学成分是CaNaKBa[AlSiO]₁₂H₂O。所获得的数据集可用于各种目的：其他作者可利用它来比较在世界其他地区发现的类似沸石晶体的形态特征和化学成分，可与从类似地质环境中获得的数据集进行比较，以促进对热液过程的研究，并且从工业角度来看，它可以作为沸石潜在勘探的起点。
