Why does obsidian rock contain no crystals? - Answers
Jun 16, 2024 · Since obsidian has no crystals, it therefore has no grain size. Obsidian is a type of volcanic glass that lacks a crystalline structure, so it does not contain mineral grains.
What igneous rock has no visible crystals? - Answers
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.
Are there volcanoes in Pennsylvania? - Answers
Jun 4, 2024 · Yes, obsidian is not naturally found in Pennsylvania. Obsidian is typically formed from volcanic activity, and Pennsylvania does not have any active volcanoes within its …
Is the obsidian rock made under earths crust? - Answers
Feb 4, 2025 · Obsidian is a type of volcanic glass that forms when lava cools rapidly without crystal growth. It is not formed under the Earth's crust, but rather on the surface during …
What are very smooth rocks called? - Answers
Jun 13, 2024 · obsidian obsidianWhy do the rocks located in stream beds are smooth? Rocks in stream beds can become smooth due to a process called abrasion. As water flows over the …
What is naturally occurring alcohol and how does it differ from ...
Feb 10, 2025 · Is obsidian a diamond? No, obsidian and diamond are two different materials. Obsidian is a naturally occurring volcanic glass, while diamond is a crystalline form of carbon.
Where is obsidian on the periodic table and which number
Dec 9, 2024 · Obsidian is not an element, therefore it does not have an atomic number or a place on the Periodic Table. Obsidian is a volcanic glass which forms when lava cools rapidly.
What is volcanic glass? - Answers
Jun 10, 2024 · Obsidian is a glass of volcanic origin. Siliceous volcanic glass is also known as obsidian. The atoms in volcanic glass are highly disorganized. Volcanic glass is not a mineral.
What rock has large mineral grains? - Answers
Jun 10, 2024 · Granite has large mineral grains compared to obsidian, basalt, and pumice. Granite is an intrusive igneous rock that forms deep within the Earth's crust, allowing for the …
What is the difference between obsidian and coal? - Answers
May 24, 2024 · Obsidian is a natural volcanic glass that is typically black and glassy in appearance, whereas coal is a sedimentary rock that is typically black and dull in appearance.