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What type of igneous rock is this dark volcanic rock shiny like glass with sharp edges?
The dark volcanic rock you are describing is likely obsidian. Obsidian is a naturally occurring glass formed from rapidly cooled lava, which gives it a shiny appearance and sharp edges. Its lack of crystalline structure is what differentiates it from other igneous rocks, and it is often used for cutting tools and decorative items.
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What is an example of volcanic glass?
Obsidian is a common example of volcanic glass. It is formed when molten lava cools rapidly, creating a glassy black or dark-colored rock. Obsidian is often used in jewelry and as a cutting tool due to its sharp edges.
What is volcanic glass with no crystaline strucutre that breaks with very sharp edges?
Volcanic glass with no crystalline structure is known as obsidian. It forms when lava cools quickly, preventing the formation of crystals, resulting in a smooth, glassy texture. Obsidian is known for its sharp edges when fractured, making it useful for tools and cutting instruments in ancient times. Its unique properties also make it popular in jewelry and decorative items today.
Is Obsidian known as volcanic glass?
Yes, Obsidian is known as volcanic glass. It is a natural glass formed from rapidly cooled lava, typically from volcanoes. Obsidian has a shiny appearance and is commonly used in jewelry and tools due to its sharp edges when fractured.
What type of rock is siliceous volcanic glass?
Siliceous volcanic glass is a type of rock known as obsidian. It forms when molten lava cools quickly, preventing the formation of distinct mineral crystals and resulting in a smooth, glassy texture. Obsidian is typically dark in color and is commonly used in tools and jewelry due to its sharp edges and attractive appearance.
Is there such thing as obsidian?
Yes, obsidian is a naturally occurring volcanic glass formed when lava cools rapidly, often with minimal crystal growth. It is commonly black in color and has been used historically for tools and decorative items due to its sharp edges when fractured.
What is Volcanic glass with no crystaline structure and breaks with very sharp edges?
BASALTIN
What rock is actually glass and has sharp edges?
Obsidian is a type of volcanic glass that is formed when lava cools rapidly. It typically has a black or dark brown color and has sharp edges due to its lack of crystalline structure. Obsidian is often used in making tools and weapons due to its sharpness.
Volcanic glass with no crystaline structure breaks with very sharp edges?
This type of volcanic glass is called obsidian. It is formed during rapid cooling of molten lava, preventing the development of a crystalline structure. Its lack of crystal structure allows for the creation of very sharp edges when it breaks, making it historically useful for tools and weapons.
What is an example of volcanic glass?
Obsidian is a common example of volcanic glass. It is formed when molten lava cools rapidly, creating a glassy black or dark-colored rock. Obsidian is often used in jewelry and as a cutting tool due to its sharp edges.
A mineral with a sharp edge?
Obsidian is a volcanic glass that often forms with sharp edges due to its rapid cooling process. Its conchoidal fracture gives it razor-sharp edges that have been historically used for cutting tools and weapons by various cultures.
Why is glass so sharp?
Glass is sharp because of its molecular structure. When glass breaks, it forms jagged edges and sharp points because the molecules in glass are arranged in a way that allows them to easily break apart into sharp pieces.
Where is obsidian most commonly found and what makes it unique compared to other types of volcanic glass?
Obsidian is most commonly found near volcanic areas where lava has cooled rapidly. It is unique compared to other types of volcanic glass because it is usually black in color and has a smooth, glassy texture. Additionally, obsidian is known for its sharp edges and ability to be easily fractured into sharp tools.
Is Obsidian known as volcanic glass?
Yes, Obsidian is known as volcanic glass. It is a natural glass formed from rapidly cooled lava, typically from volcanoes. Obsidian has a shiny appearance and is commonly used in jewelry and tools due to its sharp edges when fractured.
What type of rock is siliceous volcanic glass?
Siliceous volcanic glass is a type of rock known as obsidian. It forms when molten lava cools quickly, preventing the formation of distinct mineral crystals and resulting in a smooth, glassy texture. Obsidian is typically dark in color and is commonly used in tools and jewelry due to its sharp edges and attractive appearance.
Is glass a safety concern?
Glass is a safety concern, because when glass breaks it forms pieces with extremely sharp edges that can easily cut someone.
What kind of rocks make up make up of the igneous rock Where can you find such rocks?
Igneous is derived from the Latin word for fire (ignis), which is very appropriate since igneous rock can be created by volcanic action. It is the oldest form of rock and can be found where ever the earth's crust has been opened by volcanoes or earthquakes, allowing molten rock to seep to the surface. (Think: Islands!) Four types of igneous rock exist: 1. Obsidian: extrusive (forced to the surface) igneous rock that is actually glass and not minerals. Sharp edges, smooth surface. 2. Pumice: another extrusive igneous rock but, unlike obsidian, this volcanic rock was pitted by millions of tiny air bubbles. It, too, is glass and not minerals... and it can float! 3. Granite: very hard igneous rock formed deep within the earth and composed of feldspar and quartz. This is intrusive igneous rock because it is formed below the surface of the earth. 4. Scoria: extrusive, glass, with a pitted surface much like pumice. Scoria is more dense and has a darker color with much larger pits.
I need to find out if my sugar bowl is cut glass. how can i tell?
Feel the bowl with your fingers,, molded glass will feel smooth without any sharp edges. Cut or etched glass will have very sharp edges where the glass has been cut or ground. True cut glass is usually much heavier also because these peices are usually made from thick lead glass.
