Cinnabar akin to that of HgO: each Hg center has two short Hg−S bonds (each 2.36 Å), and four longer contacts (with 3.10, 3.10, 3.30, and 3.30 Å separations). In addition, HgS is found in a black, non-cinnabar polymorph (metacinnabar) that has the zincblende structure. Cinnabar generally occurs as a vein-filling mineral associated with recent volcanic activity and alkaline hot springs. Cinnabar is deposited by epithermal ascending aqueous solutions (those near surface and not too hot) far removed from their igneous source. It is associated with native mercury, stibnite, realgar, pyrite, marcasite, opal, quartz, chalcedony, dolomite, calcite and barite. Cinnabar is
The K-Metal from Krypton The K-Metal from Krypton "The K-Metal from Krypton" is an unpublished Superman story written by Jerry Siegel in 1940 and originally illustrated by the Joe Shuster Studio. The reason why National Comics (later to become DC Comics) never published the story is not known. This storyline features the precursor to Kryptonite called "K-Metal" and Lois learning that Clark Kent is Superman. Like all Superman stories of the 1940s, the adventure originally had no title. The earliest known occurrence of the name "The K-Metal from Krypton" for the tale was in Gerard Jones' 2004 book "Men of Tomorrow". The story remained