0
Both are made from volcanic rock. Pumice forms when lava cools very quickly and still has pockets of air trapped inside. This make the rock very lightweight and porous -- it can even float on water! Obsidian also forms when lava is quickly cooled, but it does not have trapped air pockets inside. It looks like glass and is rather brittle, but makes an excellent material for sharp cutting implements.
What else can I help you with?
What is the relationship between basalt gabbro and obsidian?
Basalt and gabbro are both igneous rocks that form from the cooling and solidification of magma. Basalt is fine-grained and forms from lava flows on the Earth's surface, while gabbro is coarse-grained and forms from magma that cools beneath the surface. Obsidian is a volcanic glass that forms when lava with a high silica content cools rapidly, without time for crystal growth, resulting in a smooth, glassy texture.
What type of texture does gabbro have?
Gabbro typically has a coarse-grained texture, with interlocking grains that are visible to the naked eye. The texture is formed by the slow cooling of molten rock beneath the Earth's surface.
Which rock obsidian or gabbro would make a better arrowhead?
Obsidian. It has very fine grain or is amorphous, and it has a conchoid fracture, so it can be worked to a sharp edge and point. Gabbro, on the other hand, has a very coarse grain and it difficult to get and edge or point on at all.
Which characteristic provides the best evidence that obsidian rock formed in an extrusive environment?
The glassy texture of obsidian is the best evidence that it formed in an extrusive environment. Obsidian is rapidly cooled lava with no time for crystal growth, resulting in a smooth, glass-like texture.
What igneous rock has a smooth glass like texture?
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.
Would gabbro or obsidian make a better arrowhead?
Obsidian
What is the relationship between basalt gabbro and obsidian?
Basalt and gabbro are both igneous rocks that form from the cooling and solidification of magma. Basalt is fine-grained and forms from lava flows on the Earth's surface, while gabbro is coarse-grained and forms from magma that cools beneath the surface. Obsidian is a volcanic glass that forms when lava with a high silica content cools rapidly, without time for crystal growth, resulting in a smooth, glassy texture.
What texture does obsidian have?
A glassy texture.
What type of texture does gabbro have?
Gabbro typically has a coarse-grained texture, with interlocking grains that are visible to the naked eye. The texture is formed by the slow cooling of molten rock beneath the Earth's surface.
What texture of obsidian?
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.
What is the texure of obsidian?
Obsidian is an igneous rock with a glassy texture. Its texture is also called hyaline, the Greek word for texture.
4 most commenly know igneous rocks?
Granite, Basalt, Gabbro, and Obsidian
Which rock obsidian or gabbro would make a better arrowhead?
Obsidian. It has very fine grain or is amorphous, and it has a conchoid fracture, so it can be worked to a sharp edge and point. Gabbro, on the other hand, has a very coarse grain and it difficult to get and edge or point on at all.
How does obsidian get its unusual texture?
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.
Describe the texture of obsidian?
Obsidian is a hard, dark volcanic rock that is formed by the rapid solidification of lava. Its texture is glassy and shiny black.
What are some exaples of igneuos rocks?
basalt, granite, rhyolite, andesite, gabbro, obsidian, scoria, pumice.
Which one of these is an igneous rock is it gabbro obsidian peridotite or chert?
Gabbro, obsidian, and peridotite are examples of igneous rocks. Chert is a sedimentary rock formed from the accumulation of silica-rich microorganisms or chemical precipitation, not from the cooling and solidification of molten magma like igneous rocks.
