Have a In-Depth Knowledge of the Structure and Texture of Rocks Before Mining

Ore mining has a close relationship with the rocks. Only have a in-depth knowledge of rocks, will the ore mining get twice the result with half the effort. Here is to analyze the characteristics of the structure and texture of rocks.

The structure and texture of magmatic rocks:

The structure of the magmatic rocks depends on the magma compositions, condensation environment, especially the temperature and pressure. The structure of magmatic rocks is generally classified in accordance with the crystallization degree and crystallization size. The commonly seen structures are phaneromer structure, cryptocrystalline structure, vitric structure and porphyritic structure.

1. The phaneromer structure

In this structure, the minerals particle size is larger, and its characteristics can be distinguished and identified by naked eye, such as the color, shape, cleavage or section, etc. For phaneromer structure, if the mineral particle is roughly equal in size, then it is called equigranular structure; According to the absolute particle size, it can be divided into coarse granule, medium granule, fine granule and micro granule. Otherwise, if the mineral particle size is unequal, then it is called uneven granule structure.

2. The cryptocrystalline structure

The rocks of this kind, Its mineral granule is tiny, generally unable to be identified by naked eye and even the magnifying glass. Only under the polarizing microscope, can it be identified. The rocks of phaneromer structure and cryptocrystalline structure, are all referred to as holocrystalline structure.

3. The vitric structure

This kind of ores is composed of the amorphous vitric, without crystalline material. It generally exists in the extrusive rocks and is formed under the condition of sharp cooling.

4. The porphyritic structure

Some large sized crystal distributes in the small sized materials, forming porphyritic structure. The larger crystals are called phenocryst, and the tiny called matrix. The hypabyssal rocks and extrusive rocks are commonly fall into this structure.