论文部分内容阅读
在太行山南端的一个叫西安里的地方,岩石风化后,常滚出无数弹丸状小石球。这些小石球对走路的人来说有很大的威胁性,因为当人们一不小心踩到它时,它会象轴承一样把你滑倒在地,狠狠跌你一跤,使你啼笑皆非。于是,当地就有人给它们起了个绰号,称为“跌跤石”。调皮的“跌跤石”究竟是什么石头呢?正在这个地区勘探铁矿的地质人员,把它切磨成透明的小薄片,放在显微镜下鉴定,发现它是以“葡萄石”(Ca_2Al_2Si_3O_(10)(OH)_2)为主的一种“球状葡萄石岩”。葡萄石,最早由一位名叫普列恩(C.V.Prehn)的外国人在非洲首次发现,就以他的名字命名,称为“普列恩石”(Prehnite),大概因为它的结晶集合体有时呈葡萄状的缘故,所以在日本和我国则称为“葡萄石”了。这里,被称为“跌跤石” 的小球体有白色和绿色两种。白球直径多在2—4厘米,组成矿物除葡萄石外,发现有方解石、透辉石、绿帘石、绿泥石、磷灰石及方柱石等多
In the southern end of the Taihang Mountains, a place called Xi’an, rock weathered often roll out numerous pellets of small ball. These small balls of stone are very threatening to the walking people because when people accidentally step on it, it slides you down like a bearing and makes you feel ridiculous. So, some people in the area gave them a nickname, called “Stone Falls”. Naughty “stone ” What is it? Geological exploration of iron ore in the area, cut it into a small transparent sheet, identified under a microscope and found that it is (Ca_2Al_2Si_3O_ (10) (OH) _2) dominated by a “globular gravel rock ”. Grape stone, first discovered by a foreigner named CVPrehn in Africa, was named after him “Prehnite,” presumably because of its crystallization Aggregates are sometimes grape-like sake, so in Japan and China is called “grape stone ” of the. Here, the small ball known as “Stone ” has two kinds of white and green. White ball more than 2-4 cm in diameter, in addition to the composition of mineral grapes, found in calcite, diopside, epidote, chlorite, apatite and more