The most colorful of all may just be rainbow obsidian, which features an array of iridescent colors, including shades of green, purple, and blue. Colorful, sure, but we’d say it reminds us more ...

Obsidian is perhaps best known in its role as the dark black blade atop ancient ... including shades of green ... This molten earth origin is what classes rainbow obsidian as an igneous rock.

It appears as a dark glassy rock that’s typically black, although it can take on hues of green, brown, and other colors due to impurities. Snowflake obsidian properties ...