The correct answer is: d) Jaintia Hills
Sillimanite is a valuable mineral used in refractories. It is found in the Jaintia Hills of Meghalaya. The Jaintia Hills are a mountain range in the northeastern Indian state of Meghalaya. The hills are part of the Garo-Khasi-Jaintia Hills, which are a sub-Himalayan mountain range. The Jaintia Hills are known for their scenic beauty and their rich cultural heritage. The hills are also home to a number of important mineral deposits, including sillimanite.
Sillimanite is a silicate mineral that is found in metamorphic rocks. It is a member of the aluminum silicate group of minerals, and it is closely related to andalusite and kyanite. Sillimanite is a hard mineral, and it has a Mohs hardness of 6.5 to 7. It is a white or gray mineral, and it has a vitreous luster. Sillimanite is used in a variety of applications, including refractories, ceramics, and abrasives.
Refractories are materials that are used to withstand high temperatures. They are used in a variety of industries, including the steel, glass, and ceramic industries. Sillimanite is a valuable refractory material because it is strong and it can withstand high temperatures.
Ceramics are materials that are made from clay and other minerals. They are used in a variety of applications, including cookware, tableware, and building materials. Sillimanite is a valuable ceramic material because it is strong and it can withstand high temperatures.
Abrasives are materials that are used to grind and polish other materials. They are used in a variety of industries, including the automotive, aerospace, and construction industries. Sillimanite is a valuable abrasive material because it is hard and it can withstand high temperatures.