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fine grained
What else can I help you with?
Is obsidian course-grained or fine-grain?
fine grained
What is a glassy grained extrusive rock?
Obsidian.
What is the texture of the very finest grained rocks called?
vitreous or glassy (obsidian)
Are extrusive rocks finely grained?
Yes extrusive rocks are fine grained because they cool down at a faster rate.
A glassy fine grained extrusive rock?
This description likely fits obsidian, a natural glass formed from rapidly cooling lava. Obsidian is characterized by its fine-grained texture and shiny, smooth surface. It is commonly black, but can also be found in other colors like brown, red, or green.
Is quartzite rock fine grained course grained or medium grained?
Coarse
Is gneiss coarse or fine grained?
Gneiss is course grained but it has a fabric.
What igneous rock has no visible crystals?
Granite is a coarse grained igneous rock without Pyroxene.
What metal would be more plastic or ductile a fine-grained steel or a course-grained steel?
G
A black rock formed from cooled lava?
Obsidian
What are three types of igneous rock?
Three types of igneous rocks are basalt, granite, and obsidian. Basalt is a dark-colored fine-grained rock, granite is a light-colored coarse-grained rock, and obsidian is a natural glass formed from rapidly cooled lava.
Explain pegmatite is coarse grained with large crystals basalt is fine grained with small crystals and obsidian has no crystals?
Crystal size in these rock types is determined by their rate of cooling. Pegmatites have large crystals due to very slow cooling. Obsidian has microscopic crystals due to almost instantaneous cooling.
