Obsidian Entertainment, Inc. is an American video game developer based in Irvine, California.It was founded in June 2003, shortly before the closure of Black Isle Studios, by ex-Black Isle employees Feargus Urquhart, Chris Avellone, Chris Parker, Darren Monahan, and Chris Jones.. Although they have created original intellectual property, many of their games are sequels …

Obsidian (/ ˌ ɒ b ˈ s ɪ d i ən /; / ə b-/) is a naturally occurring volcanic glass formed when lava extruded from a volcano cools rapidly with minimal crystal growth.It is an igneous rock.. Obsidian is produced from felsic lava, rich in the lighter elements such as silicon, oxygen, aluminium, sodium, and potassium.It is commonly found within the margins of rhyolitic lava flows known …

Etymologie. Der Name leitet sich von dem Römer Obsius her, der in der Antike den ersten Obsidian von Äthiopien nach Rom gebracht haben soll.. Entstehung. Obsidian entsteht bei rascher Abkühlung von Lava mit einem Massenanteil an Wasser von maximal 3–4 %. Bei höheren Gehalten an flüchtigen Stoffen (neben Wasser hauptsächlich CO 2) würde sich sonst, auch bei …