________, a rock-forming silicate mineral, is used as an insulator in electrical equipment and occurs as large crystals with quartz and feldspars in pegmatites.
A)Hornblende
B)Graphite
C)Olivine
D)Muscovite

Question

Quizplus · Accepted Answer

Muscovite is a rock-forming silicate mineral commonly used as an insulator in electrical equipment. It also occurs as large crystals with quartz and feldspars in pegmatites. Hornblende is a silicate mineral but is not commonly used as an insulator. Graphite is not a silicate mineral, and olivine is not commonly used as an insulator and does not occur with quartz and feldspars in pegmatites.

________, a Rock-Forming Silicate Mineral, Is Used as an Insulator