Question

Igneous rock texture refers to ____ size

Answer 1

Answer: Crystal

Explanation:

The texture of a rock refers to the size of a crystals, that helps in understanding how a rock formed and how the crystallization of magma has taken place.  The texture of an igneous rock depends upon the following factors, such as-

• Cooling rate  of magma
• Type of magma and its viscosity
• Crystallization order of different minerals

Some of the types of igneous textures are as follows-

• Aphanitic texture- Here the crystals are too small to be seen with naked eye. It often forms when lava cools rapidly after eruption. Example, basalt.

• Phaneritic texture- Here, the crystals are large enough and easily distinguishable, formed under the earth's surface. Example, granite.
• Porphyritic texture- Here, larger crystals are embedded in the middle of smaller crystals or matrix. Example, porphyry-granite.
• Pegmatitic texture- Here, the rock contains large and massive crystal. Example, pegmatite.
• Glassy texture- When the rocks are comprised of glassy materials, then it is called glassy or vitreous texture. Example, obsidian.

Answer 2

Igneous rock texture refers to Crystal size