Saturday, 23 April 2016

Classification of Rocks

Classification of Rocks:

Building stones are obtained from rocks occurring in nature and classified in three ways.

1. Geological classification
2. Physical classification
3. Chemical classification

I. Geological  Classification:

According to this classification, the rocks are of the following types.

a. Igneous rocks: Rocks that are formed by cooling of Magana (molten or pasty rocky material) are known as igneous rocks. Eg: Granite, Basalt and Dolerite etc.

b. Sedimentary rocks: these rocks are formed by the deposition of production of weathering on the pre-existing rocks. Examples: gravel, sandstone, limestone, gypsum, lignite etc.

c. Metamorphic rocks: These rocks are formed by the change in character of the pre-existing rocks. Igneous as well as sedimentary rocks are changed in character when they are subject to great heat and pressure. Known as metamorphism. Examples: Quartzite, Schist, Slate, Marble and Gneisses.

II. Physical Classification:

This classification based on general structure of rocks.
According to this, the rocks are classified into three types

a. Stratified Rocks: These rocks posses planes of stratification or cleavage and such rocks can be easily split along these planes

Ex: sedimentary rocks

b. An stratified rocks: The structure may be crystalline granular or compact granular. Examples: Igneous rocks and Sedimentary rocks affected by movements of the earth.

c. Foliated Rocks: These rocks have a tendency to split up in a definite direction only. Ex: Metamorphic rocks.

III. Chemical Classification:

According to this classification rocks are classified into three types.

a. Siliceous rocks: In these rocks, silica is predominates. The rocks are hard; durable and not easily effected by weathering agencies. Ex: Granite, Quartzite, etc.

b. Argillaceous Rocks: In these rocks, clay predominates. The rocks may be dense and compact or may be soft.

Ex: slates, Laterites etc.

c. Calcareous rocks: In these rocks, calcium carbonate predominates. The durability to these rocks will depend upon the constituents present in surrounding atmosphere. Ex: Lime Stone, marble etc.

Article by
St.Mary's Group
Civil Dept.

Monday, 20 April 2015

About St.Mary's

St. Mary's Group of Institution Hyderabad was conceived by visionary leader Rev. K.V.K Rao. In the 1996, his vision gave raise to Joseph Sriharsha & Mary Indraja educational society, which currently has a strong foothold of 28 institutions offering programs to student community by providing quality education to urban, semi-urban & rural students of National & International. With 18 years of Academic Excellence in Technical Education it has an enormous student base of 17,000 students from 28 states and 24 countries. It has a standard of on par excellence with ISO 9001 : 2000 Certificate.

The group offers various courses like B.Tech, B. Pharma, B.Ed, Polytechnic, M.Tech, MCA, MBA, M. Pharma, and PGDM which is approved by ACITE, Programs Accredited by NBA and affiliated to JNTUH, JNTUK, OU, ANU & WBUT. The group has institutions at Hyderabad, Guntur, Kolkata and Prakasham.

St Mary's Group of Institutions, Hyderabad is well articulated campus located on the outskirts of Hyderabad city at Deshmukhi (v) on Vijayawada highway near Ramoji film city behind Mount Opera. The college is located amidst sprawling and greenery between the mountains and concrete laid approach roads within the campus with a congenial atmosphere for learning. The premises spread over 120 acres of land has open spaces like lawns, gardens, seating areas, supplement the grandeur of the environment and provide calm & peaceful atmosphere to conduct academic & research pursuits. St. Mary's is the First College of approved by AICTE for foreignstudent's admissions about 300 International students are pursuing various Technical Courses. It is only group to admit over 500 students every year from different States of India. The strength of St. Mary's is highly qualified and effective doctorate Faculty with rich Academic & Research experience.