The correct answer is: a) Karbi Anglong.
Sillimanite is a valuable refractory mineral that is found in the Karbi Anglong region of Assam. It is a hard, white or gray mineral that is used in the manufacture of ceramics, glass, and other products. Sillimanite is also used as a refractory material, which means that it can withstand high temperatures without melting or decomposing.
Karbi Anglong is a district in the state of Assam, India. It is located in the north-eastern part of the state and is bordered by the districts of Nagaon, Golaghat, Jorhat, and Dima Hasao. The district has a population of over 1.5 million people and is home to a number of different ethnic groups, including the Karbi, Dimasa, and Garo.
The district is known for its natural beauty and its rich mineral resources. Sillimanite is one of the most important minerals found in the district and is mined in a number of different locations. The mineral is used in a variety of industries, including the ceramics, glass, and refractory industries.
Sillimanite is a valuable mineral that is found in the Karbi Anglong region of Assam. It is a hard, white or gray mineral that is used in the manufacture of ceramics, glass, and other products. Sillimanite is also used as a refractory material, which means that it can withstand high temperatures without melting or decomposing.