Obsidian Rock Facts Obsidian is an igneous rock that forms when molten rock cools very rapidly. The result is a rock that cooled so fast, crystals did not get a chance to form. Obsidian is a volcanic glass with a smooth and uniform structure. Interesting Obsidian Rock Facts: Different ...
Obsidian is a kind of rock known sometimes as volcanic glass. When it fractures, it holds a very sharp edge, which made it a useful tool for ancient cultures around the world. Answer and Explanation:1 Obsidian is an igneous rock because it forms directly from cooled lava. Specifically, we...
OBSIDIAN Obsidian is an extrusive igneous rock formed when a felsic lava erupts from a volcano and cools too quickly to allow crystals to form, resulting in a glass. Obsidian ranges in color from clear to green to most commonly black. Obsidian is usually 70% or more SiO2 and similar in ...
Obsidian is an extreme variety ofigneous rockwith a glassy texture. Most popular accounts say that obsidian forms when lava cools very quickly, but that is not quite accurate. Obsidian starts with lava very high in silica (more than about 70 percent), such as rhyolite. The many strong chemic...
Obsidian is a naturally occurring volcanic glassformed when molten lava from a volcano cools rapidly with minimal crystal growth. It is anigneous rock, meaning it forms from the cooling and solidification of magma or lava. The rapid cooling of lava occurs when it comes into contact with water,...
Classification:Igneous Rock A naturally formed glass without crystal. Obsidian is usually rhyolitic structure, usually black or red color.Obsidian (English Name: Obsidian) is a common black gem, volcanic crystal, also known as "Dragon Crystal", "ten stone", is a natural form of silica, usually...
What type of igneous rock is obsidian? Is amethyst a igneous rock? Is obsidian igneous, sedimentary, or metamorphic? Is flint an igneous rock? Is quartz a carbonate mineral? Obsidian exhibits a(n) ___ texture. a. glassy b. porphyritic c. coarse-grained d. fine-grained Is feldspar...
Obsidian is a glassy igneous rock that usually forms as an extrusive, fast-flowing lava. When the lava cools so rapidly that atoms can't form into a crystalline structure, this glassy rock is the result.It has a smooth, uniform texture and can come in many different colors. While it is...
Where Obsidian is Found? What is Obsidian? Obsidian Rock Color:Deep black or blackish green Fracture:Conchoidal Mohs scale hardness:5 – 6 Luster:Vitreous Specific gravity:c. 2.4 Optical properties:Translucent Obsidian is a volcanic glass that occurs naturally as an extrusionaryigneous rock. ...
Obsidianis a form ofvolcanic glassproduced by rhyoliticvolcanism.Rhyoliteis an igneous rock with silica content in excess of 65% SiO2. Obsidian is formed when rhyoliticmagmawith a low gas and water content quickly cools to form a solid without the time for a crystalline phase to develop, creati...