9 Different Types of Structure of rocks – Civillearners
Following are the different types of Structures:
1) Compact crystalline:
Fine grains or particles are held together in a compact crystalline form, e.g., marble, quartzite, etc.
Grains are round and of differmt size’s. they arc cemented by some binding material.
In this type of texture, the arrangement of minerals is in the form of parallel layers.
It is like glass without any crystal.
5) Granular crystalline :
Crystals are of similar size. They are separate. But binding materials, e.g., they are held together by some sandstone, gneiss, etc.
Also read: Characteristics of materials
6) Pisolitic :
Grains are bigger in size and they are as large as peas.
7) Porous granular:
Grains are in the form of irregular minute particles and rock with such texture is not durable.
In this type of texture, crystals of one or more minerals are large and predominant.
This texture 1s indicated by small irregular cavities on a rock surface.
Also read: Quarrying of stones
Fracture of a rock:
The type of surface obtained, when a rock is broken, indicates its fracture. For rocks with cleavage, the breaking should be done in a direction other than that of cleavage. Fracture of rock helps to determine its texture. Fractured surfaces arc mostly irregular. Their different types are as follows:
It resembles earth, e.g., chalk.
The fracture surface is more or less plane. Such a fracture denotes crystalline texture.
( 4) Fibrous:
Fracture surfact· is in the form of fibers as m case of asbestos.
It indicates a rough and broken surface with sharp edges.
The fracture surface is rough due to minute elevations and depressions. Such a fracture indicates granular texture.