![]() ![]() ![]() Strontium concentration in soils is 0.035 mass % as a whole. Strontium is accumulated within radiolarians, the marine protozoa the skeletons of which consist almost entirely of Sr S O 4. Some of ocean strontium concentrates in ferromanganese nodules (annually 4900 tons). Mineral waters are considered as a perspective source for its extraction. Its concentration in seawater is 0.1 mg/l, which means that oceans contain billions of tons of Strontium. Strontium is a constituent part of 40 minerals, the most important of which is celestite (celestine) ( Sr S O 4), which has the same structure as barite and forms very similar crystals forming isomorphous inclusions in various magnesium, calcium and barium minerals. Strontium crustal abundance is 0.0384% and is considered to be the 15 th most abundant element following barium and yielding slightly to fluorine. Metallic strontium was isolated electrolytically in 1808 by Sir Humphry Davy. He investigated in details salts of barium, strontium and calcium, distinguished them, and offered a separation method for chlorides of three metals based on their solubility in spirits. Nevertheless, Lowitz may be credited for detecting strontianite in heavy spar. However it was late: strontianite had already been discovered in 1794. He became suspicious that a new earth was contained in it. of strontium chloride from heavy spar from Siberia. Johann Tobias (Toviy Yevseevich) Lowitz in 1795 reported that he had prepared 4-5 oz. In 1794 he prepared Strontium oxide and Strontium hydroxide. Martin Heinrich Klaproth described a series of parallel experiments made with strontianite and witherite. He called the mineral strontianite and the new earth strontia after the locality of the mine. Thomas Hope began to work on the mineral from Strontian in 1791 and in a series of experiments he showed that it contained a " hitherto unknown kind of earth". They concluded that it contained a new earth. The earliest chemical work on this mineral was by Crawford in 1790, and by Cruickshank in 1787. Mineralogists erroneously took it for fluorite or aerated barite ( Ba S O 4), a mineral consisting of barium sulphate some of them considered it as barium carbonate ( Ba C O 3), also known as witherite named after William Withering, who in 1784 recognized it to be chemically distinct from barites. A very rare mineral, which before that could be found only in a couple of collections, named after the village of Strontian, Lochaber, Scotland. ![]()
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