Silver obsidian

Obsidian is a naturally occurring volcanic glass formed in swiftly cooling lava that has a high silica content. It is not considered a true mineral, as it does not have an entirely consistent chemical content and it does not form crystals.

 Color in obsidian varies, depending on impurities in the parent lava formation. Golden sheen obsidian is formed when patterns of gas bubbles are aligned along layers created by the flowing lava before it solidified.

Silver Sheen Obsidian is a rare variety of Obsidian found primarily in Mexico.  It’s alluring iridescence is created by small inclusions of water vapor bubbles trapped inside the black volcanic glass.