The stand of calcium oxide 1305788 and amorphous silica 7631869?

Question

the content of stand of calcium oxide and amourphous silica

Answer 1

The most common constituent of sand, in inland continental settings and non-tropical coastal settings, is silica (silicon dioxide, or SiO2), usually in the form of quartz, which, because of its chemical inertness and considerable hardness, is resistant to weathering. The composition of sand varies according to local rock sources and conditions. The bright white sands found in tropical and subtropical coastal settings are ground-up limestone. Arkose is a sand or sandstone with considerable feldspar content which is derived from the weathering and erosion of a (usually nearby) granite. Some locations have sands that contain magnetite, chlorite, glauconite or gypsum. Sands rich in magnetite are dark to black in color, as are sands derived from volcanic basalts. The chlorite-glauconite bearing sands are typically green in color, as are sands derived from basalts (lavas) with a high olivine content. The gypsum sand dunes of the White Sands National Monument in New Mexico are famous for their bright, white color. Sand deposits in some areas contain garnets and other resistant minerals, including some small gemstones.

Sand is usually mostly quartz of crystalline silica. Sand that is formed from volcanic glass can have a much higher amorphous silica content but likely no more than about 75%.

Calcium oxide will not be found in most sand because it a very reactive material. The common name is Caustic Lime. When exposed to water and air it turns into Calcium Carbonate (lime stone), which is the most common mineral containing calcium to be found in sand.