Okay, a little belated, but I wrote a post for the Clarion blog about sandstone as a building material, since a commenter had asked about it a while ago: Sandstone: It's a Living.
My next post will be due mid-December... I'm trying to decide what to write about. I'm kind of tempted to talk about undersea hydrothermal systems (black smokers, white smokers, carbonate chimneys) because they're really cool. And it lets me share something I've learned in oceanic geochem this semester.