September seems to be the time to think about ROCKS! There is Pet Rock Day on the 6th or 14th depending on which website you look at and then there is Collect Rocks Day on the 16th. I grew up in an area where there was large amount of igneous rock and I had a science-teacher father who was besotted with geology and physical geography. I loved collecting rocks, especially those pieces of basalt that had been made into smooth pebbles by the pounding of the sea. These rocks were great for drawing on, decorating, making into people and rock art. And now I'm an adult I still have a 'thing' for rocks. Recently in Ireland I found myself picking up rocks and making totems on the pebbly beaches. I wrote on beaches with stones and made rock art constantly. old habits resurfaced because of the abundance of rocks to work with...and yes I did bring two rocks home! One of them is from the beach that the movie Ryan's Daughter was filmed on, the other from a town called Greystones just south of Dublin where as you guessed the beach is made from large grey pebbles. As you can also probably guess I loved The Giant's Causeway which makes rocks appear so clever.
The children at school do borrow books about rocks and crystals. They seem to run in bursts and if one child gets interested I often find the interest spreads. Below are some of my favourite rock books in the library and here is the connection to my pinterest page where I have both children's books and projects that use rocks. If you decide to 'adopt a rock' read Byrd Baylor's Everybody Needs a Rock. Children probably won't choose to read this book themselves because of the illustrations and their lack of colour, but the text is perfect and once you read it, the children understand and are keen to choose a rock.