Luboš Vrtiška, J. Sejkora, Z. Dolníček, Radana Malíková
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引用次数: 0
摘要
在捷克中部波西米亚布拉格附近的nu冰废弃铁矿的历史样品中,发现了一种非常罕见的磷矿。collinite形成白色至米色的放射状聚集体,大小可达15毫米,由具有珍珠光泽的片状晶体组成。其化学组成对应于实验式:(Ca1.87Sr0.12Ba0.01)Σ2.00(Mg0.57Fe0.41Al0.01)Σ0.99 (PO4)2.00·2H2O(富sr区)和(Ca1.98Sr0.01)Σ1.99(Mg0.58Fe0.40Al0.01)Σ0.99(PO4)2.00·2H2O(贫sr区)。Collinsite为三斜体,空间群P-1,根据x射线粉末衍射数据改进的单位胞参数为a 5.734(3), b 6.779(3), c 5.441(2) Å, α 97.33(4)°,β 108.52(3)°,γ 107.25(3)°和V 185.7(1) Å3。在铁黄铁矿的裂隙中发现了与菱铁矿伴生的colinite。
Collinsit ze železnorudného dolu v Nučicích, nový minerál pro Českou republiku - popis a Ramanova spektroskopie
A very rare phosphate collinsite was found on historical samples of chamosite from the abandoned iron mine Nučice near Prague, Central Bohemia (Czech Republic) located in Ordovician sediments of the Barrandian area. Collinsite forms white to beige radial aggregates up to 15 mm in size composed by platy crystals with pearly lustre. Its chemical composition corresponds to empirical formula: (Ca1.87Sr0.12Ba0.01)Σ2.00(Mg0.57Fe0.41Al0.01)Σ0.99 (PO4)2.00·2H2O (Sr-rich zones) and (Ca1.98Sr0.01)Σ1.99(Mg0.58Fe0.40Al0.01)Σ0.99(PO4)2.00·2H2O (Sr-poor zones). Collinsite is triclinic, space group P-1, unit-cell parameters refined from X-ray powder diffraction data are a 5.734(3), b 6.779(3), c 5.441(2) Å, α 97.33(4)°, β 108.52(3)°, γ 107.25(3)° and V 185.7(1) Å3. Collinsite was found in association with siderite in fissures of chamosite iron ore.
期刊介绍:
Bulletin Mineralogie Petrologie is a peer-reviewed journal focused especially on: mineralogy, crystal chemistry and study of crystal structures of minerals study of mineral associations and processes of their origin meteoritics, research of tectites economic geology (of ore deposits) and study of history of mining of ore deposits topographic mineralogy petrology of igneous, metamorphic and sedimentary rocks instrumental analytical methods at mineralogy and petrology mineralogy and petrology as tools for archeology and similar disciplines