The correct answer is: D. All of these.
Quartz is a mineral that is found in many parts of the world, including India. It is a hard, brittle mineral that is typically colorless or white, but can also be found in other colors such as brown, red, and black. Quartz is used in a variety of products, including jewelry, electronics, and glass.
Jamui, Gaya, and Nawada are all districts in the Indian state of Bihar. These districts are located in the eastern part of the state, and are known for their production of quartz. Quartz is found in the form of veins and nodules in the rocks of these districts. It is mined and processed for use in a variety of industries.
Quartz is a valuable mineral that has many uses. It is a major component of many rocks and minerals, and is also found in sand and gravel. Quartz is used in a variety of products, including jewelry, electronics, and glass. It is also used in construction, abrasives, and other industries.
Quartz is a renewable resource, but it is important to use it wisely. It is important to mine quartz in a way that does not damage the environment. It is also important to recycle quartz products whenever possible.