It is not true. Most crystallized (solidified, cooled) lava produces rock with an aphanitic texture (mineral grains too small to be seen without magnification).
Even in the most generalized classification, more than two igneous rocks have phaneritic textures. In that generalized classification, they are granite, diorite, gabbro, and peridotite.
They may be smooth and others may be rough. Smoothness/roughness is not a defining characteristic for igneous rocks.
Granite, diorite, and gabbro are examples of phaneritic rocks. These rocks have coarse-grained textures due to their slow cooling underground, allowing large mineral crystals to form.
By definition, yes. In contrast, aphanitic rocks do not have visible crystals.
The texture of igneous rocks with large crystals that form from slow cooling is called phaneritic. This texture indicates that the minerals had enough time to grow large enough to be visible to the naked eye. Examples of rocks with phaneritic texture include granite and diorite.
Even in the most generalized classification, more than two igneous rocks have phaneritic textures. In that generalized classification, they are granite, diorite, gabbro, and peridotite.
They may be smooth and others may be rough. Smoothness/roughness is not a defining characteristic for igneous rocks.
Phaneritic is the texture of igneous rocks. These types of rocks crystallized slowly.
Granite, diorite, and gabbro are examples of phaneritic rocks. These rocks have coarse-grained textures due to their slow cooling underground, allowing large mineral crystals to form.
By definition, yes. In contrast, aphanitic rocks do not have visible crystals.
Large size crystals that are known as phaneritic are typically found in intrusive igneous rocks. These rocks cool slowly beneath the Earth's surface, allowing the crystals time to grow to visible sizes. Phaneritic textures are characterized by crystals that are easily visible to the naked eye.
They are rocks formed from magma that cools and crystallizes on the earth surface.
The texture of igneous rocks with large crystals that form from slow cooling is called phaneritic. This texture indicates that the minerals had enough time to grow large enough to be visible to the naked eye. Examples of rocks with phaneritic texture include granite and diorite.
Porphryitic igneous rock is composed of phenocrysts embedded in a finer matrix.
Your question as phrased is unclear. I will proceed to answer both interpretations I have of your question. Note: When magma crystallizes, it forms igneous rocks. 1) What is the change of state when magma forms from igneous rock? - Melting. Rocks are the solid state of matter and magma is the liquid state (although it can be a very viscous liquid). Changing something from solid to liquid is melting. 2) What is the change of state when magma crystallizes to form igneous rocks? - Solidification/Freezing. Magma becomes too cold to continue in a liquid state, it solidifies and crystallizes into solid igneous rocks: freezing.
Yes, if magma crystallizes below Earth's surface it will form igneous rocks like granite or diorite. These rocks are known as intrusive igneous rocks, as they formed from magma that cooled and solidified within the Earth's crust.
When magma crystallizes, it becomes igneous rock. Igneous rocks are formed by the cooling and solidification of molten rock material. The texture and composition of the igneous rock are determined by the rate of cooling and the mineral content of the magma.