一切的泉水,都有些矿物质。因为,雨水从地面渗透到地下,又从地下流出到地面,总不免要溶解一些矿物质。泉水中最普通的矿物质是钙盐,其次是镁盐。石灰岩是最容易渗透的,大多数的地下水都曾通过石灰岩地区,也就有多量的钙盐。泉水中钙盐之多,我们可从岩洞中的石钟乳看出来,有一种特殊的泉水,叫作石化泉,因为含大量的碳酸钙,它能够把任何浸在泉水 All spring water, there are some minerals. Because the rain infiltrated from the ground to the ground, but also from the ground to the ground, the total inevitably have to dissolve some of the minerals. The most common minerals in spring water are calcium salts, followed by magnesium salts. Limestone is the easiest to penetrate, and most of the groundwater has passed through the limestone area with a large amount of calcium salts. There are as many calcium salts in the spring water as we can see from the stalactites in the caves, and there is a special type of spring, known as a petrochemical spring, which contains any amount of calcium carbonate and is capable of immersing in any spring water