[Answer] Which variety of gemstone is formed from natural volcanic glass?

Step 1 : Introduction to the question "Which variety of gemstone is formed from natural volcanic glass?"

...Obsidian is the most common form of natural glass and, like many other gemstones, has been used to make jewelry and carvings since the Stone Age. This gem is named after Obsius, an explorer who discovered it in Ethiopia. Obsidian is found in areas with previous or current volcanic activity, where large chunks of it are formed when lava cools rapidly. Fire obsidian is the rarest variety of this stone, displaying a rainbow of colors akin to the opal. Snowflake obsidian, black and speckled with white spots that resemble snowflakes, is quite popular.

Step 2 : Answer to the question "Which variety of gemstone is formed from natural volcanic glass?"

Obsidian:

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