Abstract Bosoite (IMA2014-023) is a new silica clathrate mineral containing hydrocarbon molecules in its crystal structure. Bosoite can be considered structurally as a silica analogue of the structure-H gas hydrate, where guest molecules are trapped in cage-like voids constructed of the host framework. The mineral occurs in the Miocene tuffaceous sedimentary rocks at Arakawa, Minami-boso City, Chiba Prefecture, Japan. Bosoite is hexagonal, and it crystallises as an epitaxial intergrowth on chibaite crystals, with the {0001} of bosoite parallel to octahedral {111} form of chibaite. Crystals are colourless and transparent with vitreous lustre. The calculated density is 2.04 g/cm3. The empirical formula (based on 2 O apfu and guest molecules assumed as CH4) is Na0.01(Si0.98Al0.02)Σ1.00O2⋅0.50CH4; the end-member formula is SiO2⋅nCxH2x+2. Bosoite has the space group P6/mmm, with the unit-cell parameters a = 13.9020(3) Å, c = 11.2802(2) Å, V = 1887.99(6) Å3 and Z = 34. The crystal structure of bosoite was refined by single-crystal X-ray diffraction and converged to R1 = 4.26% for the average model and R1 = 2.96% for the model where all oxygen sites are split.

中文翻译：

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Bosoite，一种来自日本千叶县的新型二氧化硅包合物矿物

摘要 Bosoite (IMA2014-023) 是一种新型的二氧化硅包合物矿物，其晶体结构中含有烃类分子。Bosoite 在结构上可以被认为是结构-H 气体水合物的二氧化硅类似物，其中客体分子被困在由主体框架构成的笼状空隙中。该矿物存在于日本千叶县南房总市荒川的中新世凝灰质沉积岩中。Bosoite 是六角形的，它在奇白石晶体上作为外延共生物结晶，bosoite 的 {0001} 平行于八面体 {111} 形式的奇白石。晶体无色透明，有玻璃光泽。计算出的密度为 2.04 g/cm3。经验公式（基于 2 O apfu 和假设为 CH4 的客体分子）为 Na0.01(Si0.98Al0.02)Σ1.00O2⋅0.50CH4；端元公式为 SiO2⋅nCxH2x+2。