Cinnabar in Calcite
Well it's been about a month since I last posted something from the Geological Collections so here you guys go, it's not 'pretty' by any means but is somewhat interesting. Now this particular mineral specimen is known as Cinnabar as is a mercury sulfide, being that its chemical composition is HgS. cinnabars are normally more reddish in color but can also be transparent/translucent like this particular piece. But this chunk is actually cinnabar in calcite, which is actually another fairly clear mineral.