Garnet, a common hard metamorphic mineral used for abrasives, has an internal crystal structure most similar to which other silicate mineral?
A)augite
B)biotite
C)olivine
D)plagioclase feldspar

Question

Quizplus · Accepted Answer

Garnet and olivine share a similar crystal structure known as the "island silicate" structure, where isolated SiO4 tetrahedra are surrounded by metal cations. This structure is distinct from the chain, sheet, or framework structures found in other silicate minerals.

Garnet, a Common Hard Metamorphic Mineral Used for Abrasives, Has