Minerals – Types,Distribution, Importance and Conservation
It is found in old metamorphic rock . It is layered , lighter and bright . It has insulating properties. It is used in many industries like pharmaceuticals, electric appliances, telephone ,radio, aircraft , motor vehicles etc. India ranks second in the world in the production of mica. India contributes 26 percent of the world production.
In India mica reserves are confined to Bihar, Tamil Nadu, Andhra Pradesh , Rajesthan and Karnataka. Bihar and Jharkhand contribute 60 percent of the total production in India. Deposite of mica occur in Gaya. Monghyr and Harzaribagh districts of Bihar . The world famous high quality bright white mica is found in Bihar, therefore the mica of Bihar is known as Ruby Mica. Mica is found in Nilgiri , Madurai , Coimbatore and Salem districts of Tamil Nadu, Nellorre, Guntur, Visakhapatnam and Western Godavari districts of Andhra Pradesh. Here the colour of the mica is green and is easily identified . In Rajasthan it is found in Bhilwara, Jaipur , Udaipur, Tonk, sikar and Ajmer districts ,Gwalior districts of Madhya Pradesh ,Bastar districts of Chhattisgarh, Hassan district of Karnataka, Punnallore districts of Kerala, Mahendragarh and Gurgaon districts of Haryana and Kinnaur district of Himachal Pradesh also have deposits of mica.
Copper Ore –
Copper is found in metamorphic rocks. Other metals like Silver , Tin ,Lead ,Gold etc. are also mixed with copper. Copper is very flexible. It is red brown in colour. It is a good conductor of electricity and ductile. Other metals when mixed with copper forms a new metal. Therefore , Copper is considered as key metal. Copper is used in India from ancient times. It is used in manufacturing electric cable , telephone and telegraphic instruments ,utensils and coins.
Copper + Zinc = Brass
Copper + Lead = Bronze
Copper + Gold = Rolled Gold
India ranks third among the copper producing countries of the world . Major deposits are located in Singhbhum district of Jharkhand ,alwar ,Jhunjunu ,Banswara and Jhalawar district of Rajasthan ,Darjeeling District of west Bengal ,Guntur district of Andhra Pradesh , Telangana , Sikkim , Chitradurg district of Karnataka , Garhwal , Almorha and Dehradoon districts of Uttarkhand in Kullu and Kangra valley of Himachal and Balaghat district of Madhya Pradesh.