STONES AND THEIR CLASSFICATION

- BUILDING STONES WHICH ARE OBTAINED FROM NATURAL ROCKS ARE MOST DURABLE AND ALSO LEAST EXPENSIVE OF ALL CONSTRUCTION MATERIALS.

- ROCK IS THE NAME USED TO INDICATE A SOLID PORTION OF THE EARTH CRUST

-ROCKS HAVE ONE OR MORE MINERALS . ROCKS HAVING ONLY ONE MINERAL IS CALLED MONO-MINERALIC ROCK AND THOSE HAVING MANY ARE CALLED POLY MINERALIC ROCKS.

ROCKS ARE CLASSFIED INTO 3 TYPES

A.GEOLOGICAL 

B.PHYSICAL

C.CHEMICAL

A .GEOLOGICAL ROCKS ARE OF 3 TYPES

1. IGNEOUS ROCK

2. SEDIMENTRY ROCK

3. METAMORPHIC ROCK

IGNEOUS ROCKS : ROCKS WHICH ARE FORMED BY COOLING OF MAGMA ARE                                                   CALLED IGNEOUS ROCKS.

SEDIMENTARY ROCKS : ROCKS FORMED BY GRADUAL DEPOSITION OF WEATHERING                                                PRODUCTS DUE TO PRE-EXISTING ROCKS ON THE SURFACE                                                  OF THE EARTH..

METAMORPHIC ROCKS : ROCKS FORMED DUE TO ALTERATION OF PRE-EXISTING                                                         ROCKS. IGNEOUS AND SEDIMENTARY ROCKS ARE                                                                     CHANGED  IN CHARACTER WHEN THEY ARE SUBJECTED TO                                                  GREAT HEAT PRESSURE OR BOTH

B .PHYSICAL CLASSIFICATION

1. STRATIFED ROCKS

2. UNSTRATIFED ROCKS

3.FOLIATED ROCKS

STRATIFED ROCKS : SEDIMENTARY ROCKS ARE STRATIFED ROCKS 

UNSTRATIFED ROCKS : IGNEOUS ROCKS ARE UN STRATIFED ROCKS

FOLIATED ROCKS : METAMORPHIC ROCKS ARE FOLIATED ROCKS.

C .CHEMICAL CLASSIFICATION 

1. SILICIOUS ROCKS

2. ARGILLACEOUS ROCKS

3. CALCAREOUS ROCKS

SILICIOUS ROCKS : IT CONTAINS SILICA . THESE ROCKS ARE HARD AND DURABLE.

ARGILLACEOUS ROCKS : IT CONTAINS CLAY. THESE ARE BRITTLE BUT HARD AND                                                        DURABLE.

CALCAREOUS ROCKS : IT CONTAINS CALCIUM CARBONATE. LIME STONE , MARBLE,