By G. I. Teodorovich
The current paintings. Authigenic Minerals in Sedimentary Rocks, is designed for the wide circle of lithologists, and likewise for the geologists and geochemists who're learning sedimentary rocks and ores. Its particular objective is to fan the flames of curiosity between lithologists and geologists within the geochemical surroundings linked to the formation of authigenic minerals in sedimentary rocks, to motivate paintings in tracing the series of formation of those min erals, and to direct consciousness to different genetic difficulties. The ebook under no circumstances pretends to be a determinative atlas of the authigenic minerals in sedimentary rocks; its activity is to attract the reader's cognizance to questions of foundation and, while, to equip him with systematic wisdom concerning the actual and, particularly, the optical houses of those minerals. moreover, the simplified chemical reactions indicated within the publication wiIl let one to tell apart related minerals, and also will enable him to discover quite a few mineral deposits within the box. one other goal of the booklet is to acquaint chemists and geochemists with the houses of the minerals they examine in making chemical analyses, minerals that com monly take place as polymineralic aggregates within the samples which are examined.
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Extra resources for Authigenic Minerals in Sedimentary Rocks
Separation; d) at 508-525· an exothermic "explosive" effect, probably corresponding to the crystallization of amorphous MgO that appeared during decomposition of brucite, the MgO becoming periclase in this interval; e) from 530 to 575· an endothermic effect, corresponding to the elimination of CO 2 from the main part of the magnesite structure. Nesquehonite has been found in a number of coal mines. Recently it was discovered with hydromagnesite and the more widespread magnesite in Lower Permian lagoonal deposits in the KUibyshev and Saratov trans-Volga region [Frolova, 1955).
On thermal curves (in contrast to calcite. which is characterized by a single endothermic reaction at 900 -930°), dolomite shows two endothermic effects (at 700-770° and at 900-930°); even a very small amount of alkaline-metal salts in the material will lower the temperature of the first effect. cite in thin sections. All the staining reactions on uncovered thin sections give better results when filter paper. previously moistened in distilled warer. IS used. The first Lemberg reaction involves the trea tment of the thin-section surface.
This form was first obtained by Vater artificially. It forms fibrous, hexagonal-tabular. or lenticular carbonate crystals belonging to the hexagonal system. being distinguished by its s,tructure from calcite and aragonite: it apparently develops by crystallization of CaCOs gel. 550: the mineral is uniaxial and positive. Vaterite changes to calcite with time. Maier believed that vaterite and aragonite form the shells of several modern gastropods, vaterite being the initial crystalline phase and then changing to aragonite [Chukhrov, 1955].