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Obsidian was valued in Stone Age cultures because, like flint, it could be fractured to produce sharp blades or arrowheads in a process called knapping. Like all glass and some other naturally occurring rocks, obsidian breaks with a characteristic conchoidal fracture. It was also polished to create early mirrors.
Markus Persson founded Mojang Studios in 2009.. Mojang Studios was founded by Markus Persson, a Swedish independent video game designer and programmer, in 2009. [3] [4] He had gained interest in video games at an early age, playing The Bard's Tale and several pirated games on his father's Commodore 128 home computer, and learned to programme at age eight with help from his sister.
A conchoidal fracture is a break or fracture of a brittle material that does not follow any natural planes of separation. Mindat.org defines conchoidal fracture as follows: "a fracture with smooth, curved surfaces, typically slightly concave, showing concentric undulations resembling the lines of growth of a shell". [1]
Most commonly, volcanic glass refers to obsidian, a rhyolitic glass with high silica (SiO 2) content. [7] Other types of volcanic glass include the following: Pumice, which is considered a glass because it has no crystal structure. Apache tears, a kind of nodular obsidian.
A 2013 IGN article and video listed 2b2t's spawn area as one of the six best things in Minecraft, describing the server as the "end boss" of Minecraft servers, a celebration of destruction and indifference. The article noted 2b2t's propensity towards griefing, the use of hacked clients, and player-built obscenities; and stated that players with ...
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Xbox Game Studios (formerly Microsoft Games, Microsoft Game Studios and Microsoft Studios) is an American video game publisher that is a division of Microsoft Gaming.The division was created in March 2000 and replaced Microsoft's internal Games Group.
Obsidian is usually of rhyolitic composition, and it has been used for tools since prehistoric times. [34] Obsidian scalpels have been investigated for use in delicate surgery. [ 35 ] Pumice, also typically of rhyolitic composition, finds important uses as an abrasive , in concrete , [ 36 ] and as a soil amendment . [ 37 ]