Terrestrial minerals of silica
Silica: Terrestrial minerals are detrital quartz particles. Some detrital quartz particles contain inclusions, which can be divided into gas-liquid and mineral inclusions. Based on their crystal form, mineral inclusions can also be divided into granular, needle-like, and sheet-like minerals. The type of inclusion is related to the source of quartz. Generally speaking, most gas-liquid inclusions (milky quartz) come from quartz veins; There are few gas-liquid inclusions in quartz in schist and other high-grade metamorphic rock; Quartz in volcanic rocks is often apparent as water and rarely contains inclusions; However, those with rutile acicular inclusions are mostly from granite. However, due to the complex occurrence of inclusions in the parent rock, the particles are microscopic, and identification is complicated. Its application could be more extensive. According to the extinction characteristics of quartz, it can be divided into two categories: nonwavy extinction quartz and wavy extinction quartz. Wavelike extinction is a simple optical manifestation of strain crystals, and most rocks undergo some deformation during or after crystal formation. According to statistics, in intrusive plutonic rock and metamorphic rock, there are few quartzes without wavy extinction, generally less than 10%; On the contrary, in volcanic rocks, quartz with wavy extinction is rarely seen, usually less than 10%. Moreover, as time passes, the content of wavy extinction quartz also increases accordingly. Therefore, the extinction characteristics of quartz are not a reliable indicator of the type of parent rock, and some even believe that using wavy extinction to determine the nature of the parent rock is invalid. According to the internal structure of quartz, it can also be divided into single-crystal quartz and polycrystalline quartz (also known as polycrystalline quartz). Single-crystal quartz refers to particles composed of a single crystal. In contrast, polycrystalline quartz refers to aggregating two or more crystals, including particles from igneous rock, metamorphic rock, and sedimentary rock. Generally speaking, the particles of polycrystalline quartz are relatively large, and the polycrystalline form is somewhat unstable. If you are looking for high quality, high purity and cost-effective silicon dioxide, or if you require the latest price of silicon dioxide, please feel free to email contact mis-asia.