Bill – All very interesting. I ran across the name, “Potosi Formation” earlier when i was trying to see where your drusy quartz might’ve been formed, and wondered if that might not occur in your area – though one would think, with such a name, it would be restricted to the Andes!

Yes, Joan is queen of the comment-box light verse, especially at Riverside Rambles (whose author, Larry Ayers, lives in Hannibal). Like you, she refuses to start her own blog, but I can’t complain: these comment threads would be much duller, I’m sure, if you were both busy feeding blog-monsters of your own.