Mica is a mineral made up of a series of plates or leaves. It splits easily into thin sheets.  

• These sheets can be so thin that a thousand can be layered into a mica sheet of a few centimeters high.  
• Mica can be clear, black, green, red yellow or brown. Due to its excellent di-electric strength, low power loss factor, insulating properties and resistance to high voltage, mica is one of the most indispensable minerals used in electric and electronic industries.  
• Mica deposits are found in the northern edge of the Chota Nagpur plateau. Koderma Gaya – Hazaribagh belt of Jharkhand is the leading producer.  
• In Rajasthan, the major mica producing area is around Ajmer. Nellore mica belt of Andhra Pradesh is also an important producer in the country. 

Source: NCERT – XII India People and Economy