A substance, such as stone, sand, salt, or coal, that is extracted or obtained from the ground or water and used in economic activities. Ceramic An object, such as earthenware, porcelain, or tile, made of ceramic. Mineral A substance that is neither animal nor vegetable; inorganic matter....
Glass A barometer. Diamond To adorn with diamonds. Glass A window or windowpane. Diamond (uncountable) A glimmering glass-like mineral that is an allotrope of carbon in which each atom is surrounded by four others in the form of a tetrahedron. Category:en:Carbon The saw is coated with diamo...
What does the size of a mineral tell us? Why does the size of a mineral matter?Minerals:Minerals are substances that are formed naturally in rocks or in the Earth in general. Examples of minerals include; sulphur, salt, diamond, graphite and many others. Minerals ar...
Ultramafic rocks contain ___ and are commonly found in ___. Many volcanic rocks contain volcanic glass. The glass is made of silica, SiO_2. Why is volcanic glass not considered to be a mineral? a. It is organic, b. Glass can also be manufactured by people, c. It forms on Ea...
线索词为教授所说:Phytoliths are very tiny,mineral deposits,almost like pieces of hard glass,that form in the cells or between cells of many kinds of plants.The minerals originate in the ground water that the plant absorbs through its roots.如原文所述,植物岩为沉积在细胞中或细胞间的矿物质,...
During the 20th century, cheap, lightweight, reliably made plastics became widely available and most low-cost optical devices now use plastic lenses (sometimes known as "organic glass"—made from materials such as polycarbonate) in place of glass ones (sometimes known as "mineral glass" to ...
It is an amorphous silica with a chemical composition of SiO2.nH2O. It has a conchoidal fracture that is characteristic of an amorphous glass. Precious Opal is a mineraloid. The play-of-color in opal is produced when light travels through a three-dimensional array of tiny silica spheres ...
At this price point, the case is going to be finished brass with a mineral glass crystal. Don’t let that deter you though; I know military officers who have been wearing Timex watches in the field for years and they’ve held up quite well. Timex Men's T49961 "Expedition Scout" Watch...
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Lesson 3-what is mineral