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Answer :
Final answer:
The assertion that all types of rocks have a crystalline texture is false; rocks exhibit various textures such as phaneritic and aphanitic, which are indicative of their formation environments and rates of cooling.
Explanation:
Aphanitic texture, on the other hand, is characteristic of extrusive rocks, where the crystals are too small to see without magnification, indicating a rapid cooling process, typically at or near the Earth's surface. Some rocks, such as obsidian, have a glassy texture with no crystals at all.
There are various types of rock textures. Phaneritic texture is a type of texture found in intrusive igneous rocks, in which the crystals are visible and interlock in a consistent manner, typically being larger than 0.5 mm. This texture indicates that the rock formed slowly within the Earth, allowing large crystals to develop.
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