Obsidian (/ əbˈsɪdi.ən, ɒb -/ əb-SID-ee-ən ob-) [5] is a naturally occurring volcanic glass formed when lava extruded from a volcano cools rapidly with minimal crystal growth. It is an igneous …

Obsidian is an igneous rock that forms when molten rock material cools so rapidly that atoms are unable to arrange themselves into a crystalline structure. It is an amorphous material known …

Dec 6, 2024 · obsidian, igneous rock occurring as a natural glass formed by the rapid cooling of viscous lava from volcanoes. Obsidian is extremely rich in silica (about 65 to 80 percent), is …

Jan 7, 2024 · As an amazing volcanic glass, obsidian comes in many different types. When you explore them, you’ll realize the incredible variety and value of obsidian, as they are used for …

Nov 8, 2023 · Obsidian is an extrusive igneous rock. It is occurring as a natural glass formed by the rapid cooling of viscous lava from volcanoes. Result of this formed, glass occupies more …

Jun 23, 2023 · Obsidian is a felsic, naturally occurring volcanic glass. It has 69-77% silica and is relatively high in alkalis (>7%) and low in iron and magnesium oxides. This rock is mostly …

Obsidian is a naturally occurring volcanic glass formed when molten lava from a volcano cools rapidly with minimal crystal growth. It is an igneous rock, meaning it forms from the cooling …

Obsidian typically forms near the end of a volcanic cycle and is often associated with domes of volcanic rock, such as the hills of Glass Buttes, Oregon. If obsidian is similar in composition to …

Aug 17, 2019 · The obsidian is the rock created by fast-cooled lava, the material father. Extensive obsidian formation can happen if felsic magma quickly recools on the corners of a volcanic …

Jan 11, 2024 · Obsidian is a naturally occurring volcanic glass and one of the most striking types of igneous rocks. This article delves into what obsidian is, its formation and composition, the …