Jun 16, 2024 · The texture of a rock depends on the rate that it cools. Obsidian cools so quickly that no crystals can form, therefore giving it a glassy texture.

Aug 11, 2023 · Obsidian is an extrusive rock that cooled very rapidly without forming crystals. As a result, obsidian has a smooth, shiny texture of a thick piece of glass.

Jun 12, 2024 · Obsidian cooled very quickly. It's a vulcanic glass, meaning that the crystals are so small, they had virtually no time to form an orderly crystalline texture, and are basically placed randomly.

Obsidian has a glassy texture because it cools very quickly when erupted onto the Earth's surface. This rapid cooling prevents crystal formation, resulting in a smooth, glass-like appearance. The ...

Jun 20, 2024 · Obsidian is an extrusive rock formed from rapidly cooling lava with a glassy appearance that can easily be mistaken for actual glass due to its smooth texture and lack of crystal structure.

Obsidian is an igneous rock that has a smooth glass-like texture. It is formed when lava cools rapidly without crystal formation, resulting in a glassy texture.

Jun 13, 2024 · Obsidian rocks are cooled very fast, and you cannot see the crystals in them. Intrusive rock normally has visible crystals. Extrusive igneous rock has small crystals.

This rapid cooling prevents mineral crystals from forming, giving obsidian its glassy texture and appearance. AnswerBot ∙ 9mo ago Copy Add a Comment

Nov 3, 2022 · Obsidian is a hard, dark volcanic rock that is formed by the rapid solidification of lava. Its texture is glassy and shiny black.

Jun 15, 2024 · Obsidian is a type of volcanic rock that is extremely vesicular and glassy in appearance. It forms when lava cools quickly with minimal crystal growth, resulting in a smooth texture and shiny ...