(i) Slate - It is composed of fine-grained particles which splits into thin or thick sheets. It has a blue-black color but red, green and black slates are also found.
(ii) Phyllite - This is in a more metamorphosed form than state. It has lustre due mica particles. The rocks less metamorphosed than phyllite are called slates and those more metamorphosed are called schists.
(iii) Schist - It is more metamorphosed than Phyllite and has a higher content of mica and quartz. It is of two types-Chlorite Schist and Hornblende schist.
(iv) Gneiss - It consists of coarse particles and develops incomplete cleavages and many layers. It has an excess of Feldspar, Quartz, mica, etc. Granite Gneiss is a well-known rock.
(v) Marble - It is metamorphosed from limestone and dolomite. It is a beautiful stone and is used in makings. The world famous Taj Mahal of India is a good example of building made of marble.
(vi) Quartzite - Quartzite is formed when the limestone particles are cemented by Quartz. Quartz gets deposited on the particles of sand in the form of a solution. It has the lustre of glass. Pure quartzite has 97% silica dioxide but this percentage is different in different quartzites.
Examples of metamorphic rocks metamorphosed from basic rocks:
"The world is a book, and those who do not travel read only a page", St. Augustine said. Here at www.travel-university.org we believe that every page must be read and explored. Travel is an avenue of learning that no text or classroom can teach. The world is a living classroom and you the student. We invite you to the www.travel-university.org library where you can read general interest and detail oriented articles.
