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Which igneous rocks would be formed by the fastest cooling of lava?
Glassy textured extrusive igneous rock, such as obsidian.
Which rock texture is formed from fast cooling?
When lava cools very suddenly (a process known as quenching), it creates a glassy, or hyaline, texture. This sudden cooling also creates very small, often microscopic, crystals in the rock. The most well-known example of a glassy textured igneous rock is obsidian.
What is the glassy variety of acidic magma?
Obsidian is a glassy rock formed from rapid cooling of acidic magma.
What is a light glassy rock formed from frothy lava?
Pumice.
What rock is black glassy and was formed by rapidly cooling lava?
The answer is pitchstone. it is and igneous rock.
Which characteristic provides the best evidence that obsidian rock formed in an extrusive environment?
noncrystalline glassy texture
Where does obsidian rock cools down?
Obsidian is an glassy, extrusive, igneous rock that is found in areas that have experienced rhyolitic eruptions. Obsidian is formed when the rhyolitic lava comes into contact with water. This quick-cooling results in the glassy texture of obsidian.
What is the difference between an igneous rock with a glassy texture and one with a fine texture?
The main difference is that the glassy textured igneous rock cooled from lava with extreme quickness, while the one with a fine texture cooled less quickly. Obsidian is a natural glass, created by rapidly cooling lava, where mineral crystals do not have enough time to form before the lava solidifies.
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.
Is pumice foliated?
Pumice is a light and porous volcanic rock formed when glassy lava solidifies rapidly. Some pumice clasts are known to be foliated.
What is the luster of scoria rock?
Vitreous (glassy)
What is a glassy grained extrusive rock?
Obsidian.
