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Sandstone is a type of sedimentary rock formed when small sand grains gradually come together and harden over time. These grains typically consist of quartz, feldspar, and fragments of other rocks. These materials are transported and deposited by natural agents such as water wind or ice and over many years bind together to form solid rock.How Is Sandstone Formed?Sandstone forms when sand accumulated in places such as rivers lakes or seashores is layered compressed and eventually cemented over ti

Thallium is a metal with the symbol Tl and atomic number 81. It has a silvery-white appearance and is a soft, malleable element. It occurs rarely in nature and is found in small amounts within certain minerals.HistoryThallium was discovered in 1861 by the British chemist Sir William Crookes. Its name derives from the Greek word “thallos,” meaning “green shoot,” due to the green spectral line observed in thallium. This discovery was an important example demonstrating that elements could be identi