One downside to no longer being a student is that I no longer have quite so much time to spend on blog posts (well, not if I want to be able to justify my salary), so I'm putting up an image ID challenge instead, and I'll see if I can make this a regular feature. Besides, I've noticed that these tend to be popular at other people's sites, and the reader count in my right sidebar has been edging tantalisingly close to 100 for the last few months. I want to see if I can finally hit the triple digits (the fact that I've never been able to work out exactly what that number represents is irrelevant).
If this works well, I'll try and make it a regular thing. But first up, let's start with a relatively simple one (indeed, if Aydin's reading this, I may ask him to hold off for a bit because he'll probably recognise it instantly):
Tell me what it is, and tell me something about the significance of this specimen.
UPDATE: The identity of this image is given here. The image comes from here.
Would You Kindly Help To Expand A Rock Collection
15 hours ago in History of Geology