Commodity Code

obsidian

http://resource.geosciml.org/classifier/cgi/commodity-code/obsidian

star this property definition 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. more like this
unstar this property notation
01.03.21 more like this
Obs more like this
star this property source http://www.galleries.com/Obsidian more like this
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Resource
Concept
star this property broader gemstones
star this property narrower obsidian
star this property in scheme commodity code
star this property is primary topic of obsidian& properties=notation