Knowledge expansion:
Sandstone: The size varies from several millimeters to tens of millimeters, and there are also giant sandstones with the size of 1 meter. Seen from the top, people like it very much because of its peculiar image and rich colors in the north, and it has become one of the ornamental stones. The mineral composition of diaspore is calcite, limonite, collophane, timely, barite, rhodochrosite and manganese oxide, and diaspore is composed of certain minerals, such as calcite diaspore and limonite diaspore.
The shape of galangite is mostly spherical, lentil-shaped, plate-shaped, crescent-shaped, dendritic and plant-shaped, so it is often a humanoid galangite in loess, commonly known as "ginger knot".
The size of Gao Liangyu ranges from several millimeters to dozens of millimeters, and there are also giant Gao Liangyu with 1 meter. Seen from the top, people like it very much because of its peculiar image and rich colors in the north, and it has become one of the ornamental stones. The mineral composition of diaspore is calcite, limonite, collophane, timely, barite, rhodochrosite and manganese oxide, and diaspore is composed of certain minerals, such as calcite diaspore and limonite diaspore.
Geological genetic classification of sandstone;
Sedimentary sandstone: Calcium, iron and manganese in rocks decompose under weathering, are insoluble in water, migrate with water medium to form colloidal solution, and gradually condense to form sandstone during deposition, which is attached to sedimentary rocks.
Diagenetic sandstone: During diagenesis, some elements in water medium, such as Ca, Fe and Mn, often precipitate and crystallize around carbon and organic matter, and often occur in coal measures strata and sandstone shale rich in organic matter.
Secondary sandstone: due to the development of cracks in clay layer, water migrates inward, dissolves, precipitates and crystallizes. Pseudo-kaoliang jade: It looks like kaoliang jade and is formed by weathering.
Ginger stone looks like ginger, hence the name, alias: oyster stone, ginger stone, flint. It is calcareous nodule in loess layer or weathered red soil layer. Mineral name: calcareous nodule. The efficacy recorded in traditional books and records: used for postpartum qi chong and Qi Xie. External use to treat furuncle and swelling. Modern Chinese medicine experts believe that the medicine contains a variety of trace elements necessary for human body, which can stop bleeding, eliminate phlegm, sterilize and diminish inflammation, resist fungi, reduce the content of nitrosamines in water, and has no toxic and side effects on human body, and has the function of preventing cancer. It has certain curative effect in the clinical treatment of tumor.
Calcareous nodules in loess or weathered red soil are mainly composed of calcite, calcite and clay minerals. The crystal structure of calcite belongs to the tripartite system. It is a kind of cryptocrystalline shell cement with fine crystallization and fine dispersion. White or grayish white. Earthy luster. Cleavage is invisible to the naked eye. Hardness 3. The relative density is about 2.7. Due to the doping of secondary minerals, the hardness and density are different.
The composition of secondary minerals is chronotropic: fine and irregular, which is difficult to distinguish with naked eyes; The feeling of teeth is mainly caused by the timely hardness; Other characters see Bai Shiying. Clay minerals include kaolinite, hydrated kaolinite, illite or montmorillonite (see white stone grease, yellow stone grease and sweet soil strips respectively). Their species and quantity ratio determine the soluble components, adsorption and ion exchange (that is, the characteristics of trace elements) of ginger stone.
The clay composition of ginger stone in loess also contains residual feldspar (see pumice strip), amphibole (see medical stone strip) and mica (see mica strip). They have different structural relationships with calcite: they are mainly distributed in homogeneous mixtures or clastic patches, and some are concentric, nodular and radial.