Obsidian is an igneous rock due to the nature in which it was formed. Obsidian is formed when lava from volcanoes is hurled high into the air, cools quickly upon falling and becomes the glassy rock known as obsidian.
There are no crystals in obsidian. Obsidian is volcanic glass, and by definition, lacks a crystal lattice (orderly arrangement of atoms). This is an inherently unstable arrangement and over time, obsidian will "devitrify", or alter into crystalline minerals (and therefore… Full Answer
There is a black rock known as obsidian that is extruded from volcanoes. Obsidian is hard and brittle and that is why it fractures with very sharp edges. Obsidian was used as arrowheads, obsidian carvings, and even obsidian blades in… Full Answer
Yes, natural obsidian can chip, crack, and break if hit by something. Aztecs used obsidian in arrow heads, and you can easily chip obsidian with a well placed hit with a rock. In other words: you can break obsidian easily.
Obsidian is an extrusive igneous rock. Volcanic in origin, it is very common in recent lava flows. Obsidian is primarily made of glass. Obsidian is amorphous, lacking any crystal structure found in gemstones. For more details, try asking the question… Full Answer