Option 1: Mica
Mica is a group of minerals that are known for their distinct layered structure. Although mica does contain silica, it is not predominantly made up of silica. Mica minerals consist of various elements such as aluminum, potassium, and magnesium, in addition to silica.
Option 2: Quartz
Quartz is the correct answer. It is a mineral that consists mainly of silica (SiO2). In fact, quartz is one of the most abundant minerals on Earth and is known for its hardness and resistance to weathering. It can be found in a wide range of colors and forms, including clear and transparent crystals, as well as opaque varieties.
Option 3: Olivine
Olivine is a mineral group that is primarily composed of silicate minerals with the formula (Mg, Fe)2SiO4. While olivine does contain silica, it is not predominantly made up of silica. Olivine is typically green in color and commonly found in igneous rocks like basalt.
Option 4: Pyroxene
Pyroxene is another group of minerals that contains silica but is not predominantly composed of silica. Pyroxenes are silicate minerals with the general formula AB(Si, Al)2O6.