Is obsidian course grained

Anonymous

∙ 10y ago

Updated: 8/16/2022

fine grained

Riley Wolf ∙

Lvl 13

∙ 3y ago

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?

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.

What is a type of course grained sedimentary rocks?

shale

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