Minerals and Silicates Quiz

Which subclass of silicates is divided into two subgroups: pyroxenes and amphiboles?

• Cyclosilicates

• Chain silicates

What is the general formula for pyroxenes?

• AB2C5(Si,Al)8O22W2

• XY(Si,Al)2O6

Which pyroxene is the most abundant?

• Augite

• Hornblende

What is the general formula for amphiboles?

• AB2C5(Si,Al)8O22W2

• XY(Si,Al)2O6

Which group of sheet silicates is held together by van der Waals forces?

• Clay minerals

• Chlorite group

What is the basic chemical formula for feldspars?

• (Ca,Na,K)(Si,Al)4O8

• AB2C5(Si,Al)8O22W2

Which mineral is composed entirely of silica tetrahedra?

• Anorthite

• Quartz

Which polymorph of SiO2 can only be formed at pressures greater than 10 gigapascals?

• Stishovite

• Coesite