RI020 Obsidian

Class: 4E
Name: Ng Hoi Ching
Year: 2014 – 2015
地質年代:(化石) (岩石)


Geological Age: (Fossil) (Rock)


形成:(岩石) (礦物)



Formation:(Rock) (Mineral)

Living Specimens: (Fossil)

Obsidian is a kind of natural glass. Under the high pressure of underground, Rhyolite lava can contain up to 10% water, this help lava remains liquid under low temperature. When it is erupted to the ground surface, due to the low pressure of ground surface, the water can be released rapidly.




In addition to containing a small amount of phenocryst and crystallite, Obsidian is almost entirely composed of glass. Black or dark brown dense block, sometimes it can be lithophysa structure Glasses luster with conchoidal fracture. Because of the ore body crystallization, most obsidian are dark green to black. Few exceptions will have the red and yellow colors. Natural Obsidian can have the “eye” effect under the sun.

用途:(岩石) (礦物)


Application: (Rock) (Mineral)

Obsidian have the properties of glass, conchoidal fracture will appear when they are broken, which are very sharp. In the Ancient Pala eolithic, it was used as a sword, arrow or a cutting tool, while the modern people using obsidian to make surgical scalpel blade Obsidian can be decorations and crafts materials.

分佈:(岩石) (礦物)



Distribution: (Rock) (Mineral)

It is mainly located in the central and the eastern part of Turkey. In the Central Anatolia, obsidian can be found in Bogazkoy, Bekarlar and Karakaya etc. Besides, on the eastern part of Anatolia, Erzurum, Pasinler and Rize are places that obsidian can be found