Abstract
Abstract The limestone deposit at Stora Vika, to the south of Stockholm, has been studied with special reference to the distribution of magnesium in the limestone. Such a study has also purely practical aspects, since the MgO-content of Portland cement may not exceed 5% according to Swedish cement standards. The investigation of the occurrence of pre-Cambrian carbonate rocks, which are considered to belong to the oldest sequences of rocks in Sweden, has shown that both limestone and dolomite stone occur within the same deposit. There are no successive transitional forms between the two rocks. The Ca/Mg ratio is 2 in the dolomite stone, and averages 20 — never below 10 — in the limestone. Calcite occurs commonly and in rather large quantities in the dolomite stone and is, in the present author's opinion, a reaction product formed in metamorphic processes between dolomite and silicic acid. In limestone, on the other hand, only isolated dolomite crystals occur. The highest magnesium content in the limestone ...
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