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What is a glassy fine-graind extrusive rock?
obsidian
What extrusive igneous rock has a mafic composition and a glassy texture?
Obsidian is an extrusive igneous rock with a mafic composition and a glassy texture. This rock forms from the rapid cooling of lava with high silica content, preventing the growth of mineral crystals and resulting in its glassy appearance.
Does scoria have a glassy texture?
Scoria typically has a glassy texture due to rapid cooling of magma when it reaches the surface and solidifies, forming small air bubbles within the rock. This glassy texture gives scoria its characteristic appearance and light weight.
What is the luster of scoria rock?
Scoria rock generally has a dull to glassy luster. It can appear shiny if it has a vesicular texture with many cavities reflecting light, but overall its luster is not as shiny as some other volcanic rocks like obsidian.
What igneous rock has no visible crystals?
Granite is a coarse grained igneous rock without Pyroxene.
What is a glassy grained extrusive rock?
Obsidian.
What is the glassy variety of acidic magma?
Obsidian is a glassy rock formed from rapid cooling of acidic magma.
How do Igneous rock with glassy textures?
An igneous rock with a glassy texture cooled from its' liquid state very quickly, an example of this would be obsidian, a volcanic glass.
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 a glassy fine-graind extrusive rock?
obsidian
What is a glassy rock that forms when crystals do not get to form?
feldspar
What is a polished mineral with a glassy luster called?
a rock
What extrusive igneous rock has a mafic composition and a glassy texture?
Obsidian is an extrusive igneous rock with a mafic composition and a glassy texture. This rock forms from the rapid cooling of lava with high silica content, preventing the growth of mineral crystals and resulting in its glassy appearance.
What rock is black glassy and was formed by rapidly cooling lava?
The answer is pitchstone. it is and igneous rock.
What are the similar characteristic of obsidian rock?
an odsidian rock is black,shiny and kinda glassy.
What is the name of a smooth glassy black ingeous rock?
Obsidian
What rock is black and glassy and rapidly cooling lava?
obsidian
