obsidian

ID: skos/Commodity/MIN4EU/obsidian

Item class: Concept

Label (en): obsidian

Label (hu):

Definition (en): Obsidian is the result of volcanic lava coming in contact with water. Often the lava pours into a lake or ocean and is cooled quickly. This process produces a glassy texture in the resulting rock. Iron and magnesium give the obsidian a dark green to black color. Obsidian has been used by ancient people as a cutting tool, for weapons, and for ceremonial purposes and is sometimes found by archaeologists in excavations. - http://www.galleries.com/Obsidian

Definition (hu):

Concept scheme: Commodity

Broader concept: MIN4EU list of commodities