Abstract

Stokesite, ideally CaSnSi3O9·2H2O, is a rare hydrated calcium tin inosilicate mineral. The stokesite reported in this paper was found on the surface of large magnetite crystals within cavities of tin-iron ore at the Huanggangliang iron deposit, Chifeng, Inner Mongolia, China, and is associated with calcite, andradite, magnetite, vesuvianite, cassiterite, fluorite, quartz, mica, and clinochlore. Dominant forms are pinacoids {100} and {010} and orthorhombic bipyramid {344}. The empirical formula, calculated on the basis of nine O atoms per formula unit except for H2O, is (Ca0.94Mn0.09)Σ1.03(Sn0.97Fe0.05)Σ1.02Si2.99O9·2H2O, Z = 4. The crystal structure of stokesite was refined in space group Pnna, a 14.4783(12), b 11.5879(10), c 5.2292(4) Å, V 877.32(12) Å3, R = 0.037. The crystal structure contains (Si3O9) chains and Sn and Ca polyhedra. Here, we report and discuss the infrared spectrum, the differential thermal curve of stokesite, and the hydrogen bonding. Chifeng stokesite is a low-temperature hydrothermal mineral.

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