There is siderite, iron dolomite , calcite, Barite, pyrite, anatase, rutile, piece quartz, the mica ( or hydromica ), diaspore,etc. in the impurity in the mineral .
杂质矿物见有菱铁矿,铁
石,方解石,重晶石、黄铁矿,锐钛矿,金红石,碎屑石英,
母(或水
母),水铝石等。
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That is probably why the United States government has a strategic helium reserve, which I didn't believe either when I first heard it, but we do: 16 billion cubic feet of the stuff trapped in dolomite deposits in Texas.
这可能是为什么美国政府战略性地储存氦的原因,第一次听说时我也不信呢,但事实就是如此:一百六十亿立方英尺的氦储存在德克萨斯州白云石沉积物中。