Blue rocks fascinate me. It seems like such a non-rock color to me. I fell in love with the blue mineral in quartz matrix which is called Kyanite the first time I saw it many years ago. In fact, it starting me on a small collection of blue minerals back when I was a collector. Although some people do make jewelry with Kyanite, it typically is not considered a gemstone. It has some industrial use… and of course is of value to collectors.
The background rock is a geode. This photo was taken surreptitiously, thus I thought it was lucky to catch the same colors in a different type of rock right there in the background.