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