Igneous Rock Textures

On this page you have the igneous rock textures. 

There are three main types.

They are interlocking, fragmental and glassy.

Interlocking Texture

This is the largest group, called crystalline. The mineral crystals of those rocks have intelocked like in a jigsaw puzzle. There are three types of them: Phaneritic rocks have large grains that can be seen with bare eyes. Aphanitic rocks have fine grains which are too small to be seen without a hand lens or a microscope. Porphyritic rocks have two different sizes of minerals - large phenocrysts, and fine-grained matrix.

 igneous rock textures
 Crystalline texture of granite. ┬ęcollecting-rocks-and-minerals.com

Glassy Texture

The rocks in this group are called glassy because their matrix is glassy - they reflect light like glass, and often break like glass. Those rocks are either made of glass or tiny crystal surrounded by glass because the cooling has been extremely quick and minerals have had no time to grow.

 obsidian rock
 Glassy texture of obsidian. ┬ęcollecting-rocks-and-minerals.com

Fragmental Texture

The rocks in this group are called fragmental. They consist of igneous fragments such as mineral crystals, pieces of crystalline rock, or glass, that are cemented or packed together after they have solidified. They have often formed from volcanic ash and debris.

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